Michael Huemer (in his book Skepticism and the Veil of Perception 2001, APQ 2006, PPR 2007) has marshalled interesting and challenging arguments for phenomenal conservatism:
(PC) If it seems to S that p, then, in the absence of defeaters, S thereby has at least some degree of justification for believing that p. (PPR 2007, p. 30)
In his remarks, Huemer seems to imply that the degree of justification depends on the strength of the seemings. Now (PC) entails the following about hearing God's voice:
(PC*) If it seems to S that God is saying X, then, in the absence of defeaters, S thereby has at least some degree of justification for believing that God is saying X.
X could be a command to do something or a revelation about God or an expression of God's comfort or love or disapproval, and so on. Now a defeater might arise by way of revelation or other sources of knowledge. So it might seem to someone that God is telling him to kill another person, but he would have defeaters from scripture or his conscience and so on. Also, it might be the case that for some person S, any belief about what God is telling S is defeated because S has a sufficiently persuasive atheological argument that God doesn't exist.
But suppose that the main lines of Christian belief are true (what's affirmed by the intersection of the great creeds) and are undefeated for some Christian. Is PC* a good rule for that Christian to go by? (I assume that if it's true, it is a good rule to go by.) One thing I like about Huemer's epistemology is that it's relatively easy to follow in real life. One can examine what seems to oneself to be true and believe accordingly. Suppose it seems to me that God is telling me to go talk to someone specifically about Christianity (or heck, about philosophy). Given that I have no good reason to believe that it's not the case that I ought to do this, ought I conclude that God is telling me to go talk to that person? If PC* is the case, it seems that I am justified in so believing.
(Of course, some seemings are not very firm. So if we were to believe on the basis of a weak seemings, then we would only have a little bit of justification for that belief.)
I think PC* is an interesting entailment of an already plausible view, PC, that would be applicable to Christian believers (and probably, to theistic believers generally). Can anybody think of problems for this view?


Hi Andrew,
I take it you have in mind by the 'absence of defeaters' in (PC*) that S is not in possession of any defeaters.
(PC*) If it seems to S that God is saying X, then, in the absence of defeaters, S thereby has at least some degree of justification for believing that God is saying X.
To show that (PC*) is mistaken you'd need an example in which something x seems to S to be F, S is not in possession of a defeater for the proposition that Fx, and S is not (even slightly) justified in believing Fx. There seem to be such examples. There are all sorts of unstable people to whom it seems that God is speaking and S might be one of these. These individuals are in general not in possession of a defeater for the proposition that God is speaking to them. Yet you wouldn't want to say that the deliverances of S's neurosis justifies him (even a little) in believing that God is speaking to him. Suppose you would. What, then, about S', at least as unstable, who believes that a Twinkee is talking to him because it seems like a Twinkee is talking to him and he does not have a defeater for the Twinkee-talk? Nonetheless, I don't think the seeming Twinkee-talk can be evidential. Consider a Twinkee world TW in which it seems to everyone (including S*) that Twinkees are talking to them when in fact they are not, though no one in TW (including S*) knows this. Certainly, the Twinkee analogue of (PC*) is false in TW. But S*'s epistemic situation in TW is not relevantly different from the actual situation of S' which is not relevantly different from the actual situation of S.
Hi Mike,
I used to find these sorts of cases convincing, but I don't anymore. I think that most adults have defeaters for propositions like that Twinkee is talking to me. We have independent reasons to believe that Twinkies aren't sentient and aren't the sorts of beings that can talk. However, in the case of the Christian in my example, I stipulated that he doesn't already have defeaters for his Christian belief (which includes the beliefs that God does exist and is the sort of being that can speak).
Consider two other examples that show the plausibility of PC. Suppose, as a result of neurosis, it seemed to me that a man walked through a door and spoke to me. In fact, I am hallucinating, and there is no man. It seems to me that I would be justified in my belief that the man is speaking to me. In this case, I don't have a defeater like in the Twinky case.
Or suppose there is a very young child who hasn't gained the knowledge about Twinkies, that they're not the sorts of objects that can think or talk. If a child had a neurosis and it really seemed to him that the Twinky was talking to him, it seems to me that the child would be justified in believing that the Twinky was talking to him. This is because such a child would have no defeater.
Last point. I don't think that PC is a good theory of warrant (in Plantinga's sense of 'warrant' as what turns true belief into knowledge). I don't think a person with neurosis who forms the belief that a Twinky is talking to him has a warranted belief because, even if that belief were true, it would not count as knowledge since the belief is arising from neurosis and it is not appropriately connected to the Twinky itself.
I used to find these sorts of cases convincing, but I don't anymore. I think that most adults have defeaters for propositions like that Twinkee is talking to me.
Obviously, most adults have defeaters for such beliefs. But that has nothing to do with the example, that I can see. I'm assuming that the person S' is suffering under a (psychological) disability of which he is unaware. Certainly that's possible. Indeed, I'll bet it's actual. Since it's possible, and since PC tells me that S' therefore is (at least somewhat) justified in believing that Twinkees are talking to him, PC is false. All the more so for the far more common belief among the unstable population that God is talking to them. That some unstable people fail to have a defeater does not entail that they are somewhat justified in their belief that God is talking to them.
Hi Mike,
When we stipulate that S' has no defeater (he has no justified beliefs that Twinkies aren't the sorts of beings that can talk and so on), then I don't have the intuition that his belief is unjustified. I think that we might be inclined to think that his beliefs are unjustified because we project onto him the ordinary beliefs of an adult human (which is why I brought that up). But think of my cases of the child's belief or the belief caused by the hallucination, both defeaterless but seemingly justified even though produced by neurosis.
Andrew,
I don't see that (PC) entails (PC*). For Huemer, 'seems' is supposed to be understood as picking out some special sort of appearance state (e.g., the state common to a veridical experience of a red object and an indistinguishable hallucination of a red object). If there is no appearance state that has as its representational content _that God is speaking to me_, (PC*) is not a special case of (PC). Is there really an appearance state that would be _illusory_ if an object numerically distinct from God spoke to you in a way that is indistinguishable to you from an experience in which God genuinely speaks to you?
That's something I suspect Huemer would say in response. Some of us would just say that (PC) is false and accuse you of condoning cannibalism and terrorism, but that's another matter. (I have a paper where I argue that because of Huemer's moral epistemology, he has to condone cannibalism and terrorism.)
One thing I like about Huemer's epistemology is that it's relatively easy to follow in real life. One can examine what seems to oneself to be true and believe accordingly. Suppose it seems to me that God is telling me to go talk to someone specifically about Christianity (or heck, about philosophy). Given that I have no good reason to believe that it's not the case that I ought to do this, ought I conclude that God is telling me to go talk to that person? If PC* is the case, it seems that I am justified in so believing.
Who said life was easy? I can't for the life of me see why having a rule that is easy to follow counts in favor of a theory that posits that rule.
Suppose it seems to me that God is telling me to put a bomb on a bus. Given that I live around a sufficient number of confused and dangerous people, I have no good reason to believe that it's not the case that I ought to do this. Ought I conclude that God is telling me to put a bomb on a bus? If I know that this is what God told me to do, ought I just conclude practical deliberation by doing it?
No. No. No! But, I get to _stipulate_ that the appearance is robust and no defeaters are available. (You can deny that only if you are prepared to make apriori pronouncements about possible psychological profiles.) I don't see how the reasoning I've just sketched is any different from the reasoning you've just sketched and it's only the crudest sort of relativist or terrorist who would say that I've just given a justification for putting a bomb on the bus, concluding practical deliberation by doing that/intending to do that/judging that I ought to do that.
Clayton,
Huemer describes (PC) in his PPR 2007 (Jan) article by writing,
I take statements of the form "it seems to S that p" or "it appears to S that p" to describe a kind of propositional attitude, different from belief, of which sensory experience, apparent memory, intuition, and apparent introspective awareness are species. (30)
I'm not sure how you understand "appearance state", but it certainly doesn't have to include a sensory experience (as in perception) since this is not often present (arguably) in memory, and very likely not in intuition, and introspection. I can't see how its seeming to someone that God is speaking to them is different than these other seemings. Also, if it seems to me that God is telling me that he is watching over me, and that turns out to be false, I suppose my representational state would be illusory.
(Also, this may get into a tangent, but I think it's interesting to pursue. At most, (PC) would lead me to believe that, possibly, certain persons are justified in believing that cannibalism and terrorism is permissible. But that doesn't seem odd to me at all. It doesn't lead me to condone cannibalism and terrorism themselves, however.)
Clayton,
Right, right, right, my liking that aspect of the theory wasn't a reason for thinking it true. I was just saying that I liked it. =)
I'll have to think about your bus case a little more. Btw, was this a mistake when you said, "If I know that this is what God told me to do, ought I just conclude practical deliberation by doing it?" I think if you know so, then you should conclude your practical deliberation and go do it. (Perhaps I've been hanging around Matt McGrath too much, but I find his and Fantl's arguments convincing.)
My quick response (w/need for more reflection) is that if you really stipulate those points, then you would be so justified in believing. Also, perhaps more than justified belief is necessary for action in these cases. Perhaps knowledge is required for practical action in these cases. (I think that I am justified in believing that I will lose the lottery. But I think that I need something more for that belief to count as knowledge. I know that this may not square w/your view about the relationship between justification and knowledge.)
By your powers of stipulation, you can stipulate what you'd like to, I guess. But, as a matter of fact, don't most adults--even theists who believe in a personal god who does sometimes speak to people--have powerful defeaters for statements like "God is saying X to me"? Even if God occasionally speaks to people, there are lots of people who have delusions that God is speaking to them. That's an extremely common delusion. And anybody who is aware of this has reason to be suspicious of the purported voice of God.
When we stipulate that S' has no defeater (he has no justified beliefs that Twinkies aren't the sorts of beings that can talk and so on), then I don't have the intuition that his belief is unjustified.
I can't see how you could fail to have that intuition. We stipulate that S actually has the belief that Twinkee's are talking to him and this is the result of his instability. Now consider S's counterpart on Twinkee world. There, in TW, it is evident that PC is false. Everyone there believes that Twinkees are talking to them, and they are no talking. But S's mental states are the same in our world as they are in TW. If S has a justified belief that Twinkees are talking, then he has on in TW too. But he does not have one in TW. So, he does not have one here.
Mike,
I think I'm just missing the example. Is your main reason for thinking S''s belief is unjustified because it is a result of neurosis? Or because it is false?
Tim,
I don't know what you were talking about w/r/t stipulations (mine? Mike's? Clayton's?).
Okay, so the objection here isn't to PC or PC*, but to its application to, say, the everyday theist who has no undefeated defeaters for his belief. I take it that you are saying that this person's knowledge that other people are sometimes deluded provides him with a defeater. In reply, first of all, I don't think that most people know of many cases. In many cases, how do we know that God didn't speak to them? I don't think that we do know. Secondly, in many of the cases where we do know that God wasn't speaking, that person had a defeater.
Furthermore, I don't see how the knowledge that some people are wrong w/r/t their believing that God is speaking to them on the basis of seemings is enough to count as a defeater. Some people are deluded w/r/t their perceptual beliefs. I might know of a case in which it seemed to someone that he saw a sheep, and he justifiably believed that there was a sheep. It turned out to be a white rock. But that's not going to give me a defeater for my own perceptual beliefs.
I think that there is an objection in the neighborhood of what you say, but the mere knowledge that others have misleading seemings w/r/t whether God is telling them something doesn't provide a person with a defeater, just as the mere knowledge that some have misleading seemings w/r/t perception (and mathematical beliefs and memorial beliefs and...) doesn't show that a person has a defeater w/r/t their own perceptual beliefs (and mathematical beliefs and memorial beliefs and...).
I think I'm just missing the example. Is your main reason for thinking S''s belief is unjustified because it is a result of neurosis? Or because it is false?
Because it is the product of an unreliable process of belief-formation (i.e. neuroses do not in general produce true beliefs). The argument is straighforward, I think.
1. In TW (twinkee world) everyone has mistaken beliefs about twinkees caused by neuroses.
2. S is in TW and has mistaken beliefs about twinkees caused by neurosis.
3. In TW, CP is false. It is false that if it seems to S that a twinkee is talking to him, then, in the absence of defeaters, S thereby has at least some degree of justification for believing that a twinkee is talking to him.
4. S is not justified at all in TW in his twinkee beliefs
5. S's actual beliefs about twinkees are also caused by neurosis. So, S's mental states in the actual world with respect to twinkees are exactly the same as his mental states in TW with respect to twinkees.
6. /:. S's actual twinkee beliefs are not justified at all.
Hi Andrew. I was talking about your stipulation that the person had no defeaters.
Here is what I'm thinking: auditory hallucinations are (relatively) common. And quite often the person having them identifies them as coming from God (or at least it seems that way to the person). Whereas instances of God literally speaking to people are extremely rare. Since I'm atheist, I think it never happens, but do you think it happens much either? So even if I had had no other signs of mental illness, if the voice of 'god' started coming out of my radio, I'd be seriously worried that maybe I had a brain tumor or something like that. And even a theist (I think) should wonder the same thing. I don't think that that's analogous to ordinary cases of perception of memory.
Or did you have something less literal in mind by "it seems to me that God is saying X," e.g., trying to 'discern' whether God would want me to marry somebody? I don't think that that sort of thing is analogous at all to perception or memory, and worries would switch to whether the putative 'voice of God' is some sort of rationalization or wishful thinking or something else I've dressed up as God speaking to me.
Mike,
On the neuroses making a belief unjustified, what do you think about the two examples I gave in my first reply to you?
"3. In TW, CP is false. It is false that if it seems to S that a twinkee is talking to him, then, in the absence of defeaters, S thereby has at least some degree of justification for believing that a twinkee is talking to him."
I think you meant "PC". Since PC is supposed to be a necessary truth, if it's false in any world, it's false in every world. I guess we just disagree here. I don't think PC is false in any world, including in TW. I don't grant that their beliefs are unjustified.
It also seems to me that you are appealing to a Cohen-type new evil demon world scenario. But w/r/t these scenarios, most people would agree that such beliefs are justified. Imagine a possible world in which everybody was exactly like us mentally, but the processes producing all of their perceptual beliefs (or what seem to them to be perceptual beliefs) were really the product of neurosis. However, w/r/t how EVERYTHING seemed to them, they were just like us. It seems to me that their beliefs would be just as justified as us. And so it goes for the believers in TW.
Tim,
Ah, okay, just to be clear on the stipulation bit (I think this is important), I was stipulating that the Christian has no defeaters for his Christian belief (see opening post), not no defeaters for the proposition that God is saying X. Many (perhaps all?) of the Christians and perhaps even many of the nonChristians participating on this blog would think that that stipulation is actually the case for many Christians (they don't have undefeated defeaters for their Christian belief), so it's not a big stipulation.
AH, I see where you are coming from, and it helps to know that you haven't had such seeming states. Let me try to explain. It's not like discerning who to marry. So in Christian ministries I've been involved with, it's not irregular that someone has a strong sense that God is speaking to them or showing something to them. This has happened to me a few times when I've been praying or praying for someone.
Here's a relatively common example. For many Christians, there was at least some time, perhaps shortly prior to their conversion experience, that it seemed to them that God was telling them that he wanted them to follow him or that he wanted them to give their lives to him or that he loves them or that he wants to live in their hearts. This is what I experienced and what I know that many Christians have experienced. Actually, it might even be the minority of Christians that don't experience something like this at some point in their Christian lives. Now I believe that these seemings are often accompanied by their own unique phenomenological experience, just as there are unique experiences which accompany perceptual seemings, apriori seemings, memorial seemings, and so on.
So by "God is saying X", I was not meaning a literal aural voice; it's more like a sense (sorry, I wish i could say more) according to which it seems to the person that God is saying X (often accompanied by a unique phenomenological experience). So let's turn to your second paragraph. I think that the epistemic status of beliefs based on such seemings is analogous to cases like perception and memory. This is because, if (PC) is true, then they are analogous in the only important respects: whether they seem to the agent to be true, and whether they are without defeaters. And I haven't seen any strong arguments that PC is false (although I have to think more about Clayton's cases). Or I don't know what else would be relevant to justification.
Mike,
Whether your (3) is true or not depends on how one understands the relevant notion of "justification" in PC. Michael Williams and Richard Fogelin have both argued, correctly I think, that there are two different perspectives we can take when considering whether S's belief that p is justified.
From an external perspective, having "justification" connotes an objective relation of grounding. This could be cashed out, for example, in terms of S's belief's resulting from reliable cognitive processes. In this sense of justification, your (3) is certainly correct.
But we can also understand "justification" in the somewhat internal sense of epistemic responsibility. This is the sense of justification that figures in Gettier's famous paper in which he argues against JTB accounts of knowledge. In this sense, S is justified in believing that p provided that it seems to S that p, S has no reason for thinking that not-p, and S has no reason for thinking it's seeming to him that p is misleading. In this sense, I think your (3) is false. There is no reason why people in Twinkie World can't be epistemically responsible. That the world they live in doesn't cooperate with their best epistemic efforts isn't at all their fault.
It is important to notice that these two senses of "justification" are not incompatible with each other. It could be that knowledge requires both, or less controversially, that some kinds of knowledge do. (Perhaps Sosa's 'reflective knowledge' does, whereas his 'animal knowledge' only requires justification as grounding.)
As for PC, it seems to me that the relevant sense of "justification" is that of epistemic responsibility, not grounding. So understood, PC is quite plausible.
To confirm that Huemer would probably agree with what Alan just said, Huemer writes in his book,
"the notion of "justification" we are talking about is internalist, rather than externalist. That is, we are talking about what propositions are justified from the subject's own point of view. Thus, if P were false, but there were no way that S could reasonably be expected to guess that, then its falsity would have no bearing on S's justification for believing P in the internalist sense. What is "unjustified" in the internalist sense is what one could be blamed for believing." (2001, p. 104)
Thanks Andrew. Yeah, that explanation helps a lot.
I think you meant "PC". Since PC is supposed to be a necessary truth, if it's false in any world, it's false in every world. I guess we just disagree here.
No, the truth of PC obviously depends on certain contingent facts. No one has reason to take PC seriously as a epistemological principle unless he has an antecedent commitment to the view that our world is not a brain-in-vat world, for instance. That is, we need a commitment concerning certain contingent facts about the world. If we are brains-in-vats, then our perceptual evidence is systematically mistaken and naive epistemologies of perception such as Huemer's are flatly wrong. If S is asked whether our world is a BIV world and he replies "hell if I know, and I don't know the chances that it is, either", then S cannot undogmatically assume--as PC does--that the way things seem are likely to be the way things are.
Alan,
I wasn't trying to trade on the distinction between internalist/externalist views of justification. PC says this,
(PC) If it seems to S that p, then, in the absence of defeaters, S thereby has at least some degree of justification for believing that p.
Let W be a BIV world. In W nothing is the way it seems to be. So consider the following two claims.
1. In W, the fact that it seems to S that p is absolutely no indication that p is true. From BIV world.
Yet, you seem to be telling me that we should observe the following epistemological rule in W,
2. In W, if it seems to S that p, then, in the absence of defeaters, S thereby has at least some degree of justification for believing that p. From (PC)
But obviously I should not be observing (PC) in W. I might falsely believe that I should be following (PC). I might falsely believe that naive perception is evidence for the way things are--that there is some important link between it seeming to be p and it being p--but in fact the way things seem (from (1)) is systematically and absolutely no indication of the way things are. There is no evidential link at all between them, and it's pure dogma to insist that there is such a link unless proven otherwise.
Mike,
Whether you acknowledge it or not, you are implicitly relying on an externalist notion of justification in your critique of PC. That is, you take it that there must be an objectively reliable connection between justifying evidence and justified belief.
I don't think that that is the notion of justification that figures in PC. PC, it seems clear to me, has to do with justification as epistemic responsibility. And here I submit that BIVs would be epistemically irresponsible not to employ PC. After all, if they won't take undefeated appearances as prima facie evidence about reality, then they've got nothing left to work with, epistemically speaking. Sure, they're not in a good position to acquire much in the way of knowledge or to secure themselves against error, but that is wholly a function of external conditions. Due to factors outside their ken and beyond their control, they inhabit a world in which the epistemic deck is stacked against them.
It seems that you would counsel BIVs to become extreme skeptics. I would counsel them to hope for the best and to trust undefeated appearances as prima facie guides. For all they know, they aren't BIVs, so they've got no reason accessible to them for not employing PC.
Mike,
"No, the truth of PC obviously depends on certain contingent facts." Well, I don't think it does, but just to be clear, you weren't disputing my claim that Huemer at least intends PC to be a necessary truth, right? It's generally assumed that these sorts of epistemological principles are using a strict conditional. I think this explains some of my confusion above.
That Huemer intends PC to be a necessary truth (and his remarks on brains-in-vats) can be seen in the following passage:
"A corollary is that phenomenal conservatism is a necessary truth, not a contingent one. There is no possible world in which phenomenal conservatism is false, although there are possible worlds in which most of the things that appear to be so are not so. Recall the brain-in-a-vat scenario. If you were a brain in a vat, then most of the things that seemed to you to be the case would in fact not be the case. Nevertheless, it would still be reasonable for you to believe those things, given your situation, and given that you would have no evidence of your being a brain in a vat." (2001, p. 103)
Actually, if you're interested, I'd recommend you pick up his book and just read pp. 98-115. The discussion is relatively self-contained (you don't have to read the whole book), and he presents his view very clearly, taking on a variety of objections. (In the book, he restricted his principle to only foundational beliefs; in later publications, he expanded the principle to all beliefs, due to criticisms by Michael Tooley.)
If you still think the view is obviously false, well, that'd be quite interesting! I think that Huemer's view is one of the best ones out there.
Alan, you say,
And here I submit that BIVs would be epistemically irresponsible not to employ PC. After all, if they won't take undefeated appearances as prima facie evidence about reality, then they've got nothing left to work with, epistemically speaking.
Andrew (citing Huemer) says,
If you were a brain in a vat, then most of the things that seemed to you to be the case would in fact not be the case. Nevertheless, it would still be reasonable for you to believe those things, given your situation, and given that you would have no evidence of your being a brain in a vat.
Here's what I say,
No one has reason to take PC seriously as a epistemological principle unless he has an antecedent commitment to the view that our world is not a brain-in-vat world, for instance.
On what basis do I accept PC and not instead accept (PL)?
(PL) If it seems to S that p, then, unless S is has reason to believe he is not in a BIV world, then S has no justification for believing that p.
Obviously, I'm not appealing to externalism here. I am appealing to evidence S is (not) in possession of. I can see no reason except the so far unargued for assumption that I'm not in a BIV world. Huemer in the cited passage makes what I take to be the central error here. In support of using PC over PL (even in BIV worlds), he says
A. . . . you would have no evidence of your being a brain in a vat
That's true, of course, but to support the use of PC over PL, it would have to be true as well that,
B. You would have some evidence of your not being a brain in a vat.
So, to sum up, if I have as much reason to believe I am a BIV as that I am not a BIV, then I have as much reason to accept PL as I have to accept PC. Show me how that's mistaken.
Just in the interest of full disclosure, I'm not defending skepticism about perception as the right attitude. My point is that you need a hell of a lot more than the intuitive appeal of PC to defend it. Taken independently of further argument, there is no reason I can see to prefer PC over PL. You're going to need something like contextualist reasons or Huemer's direct realism or something like this, in defense of PC.
My point is that you need a hell of a lot more than the intuitive appeal of PC to defend it.
Huemer's argued for and defended PC at length in the three references given in my opening post. (They're good philosophy and very clearly written.) As I said in my opening post, I am interested in whether there are any particular problems for PC*. Of course, objections to PC are relevant to whether there are problems for PC*. Also, I wasn't purporting to give an argument for PC, and I don't think anybody was. I am interested in defending it against objections. (I (and Alan) do find it intuitively plausible and without clear counterexample, and I find that reason enough to accept it, although I'm not purporting to use that as a reason to convince others.)
Taken independently of further argument, there is no reason I can see to prefer PC over PL.
My problem with PL is that there are counterexamples. I believe that I exist on the basis of its seeming true to me. I can be justified in believing this without having a reason to believe I'm not a brain in a vat.
More to the point, suppose Sally is an ordinary six-year-old in ordinary circumstances who believes that she went to the carnival on the basis of a memorial seemings; it seems to her that this is where she went today, and she has no reason to think otherwise. Sally also has no reasons for believing she's not a brain in a vat. Intuitively, her belief is justified. That's another counterexample.
My problem with PL is that there are counterexamples. I believe that I exist on the basis of its seeming true to me. I can be justified in believing this without having a reason to believe I'm not a brain in a vat.
That's a counterexample? It looks more like an assertion. I wish skepticism about perception were that simple to refute. To anyone who does not already believe PC, it's just question begging. Let me put it this way. If that counts as a counterexample to PL, then this counts as a counterexample to PC.
My problem with [PC] is that there are counterexamples. I believe that I exist on the basis of its seeming true to me. I [can't] be justified in believing this without having a reason to believe I'm not a brain in a vat.
Andrew,
I had made a minor slip above. Here's what I meant to say:
Suppose it seems to me that God is telling me to put a bomb on a bus. Given that I live around a sufficient number of confused and dangerous people, I have no good reason to believe that it's not the case that I ought to do this. Ought I conclude that God is telling me to put a bomb on a bus? I know that if this is what God told me to do, ought I just conclude practical deliberation by doing it? Ought I just conclude theoretical deliberation by judging that I ought to do it?
We all know that there's something wrong with the following practical inference:
B1: God told me to engage in acts of terrorism.
B2: If God told me to engage in acts of terrorism, I ought to engage in acts of terrorism.
C: I engage in acts of terrorism.
You shouldn't conclude practical deliberation by performing that act, so presumably you either shouldn't judge that B1 is true or that B2 is true. But, as you know that B2 is true, it seems that you shouldn't judge that B1 is true. But, on H's view, isn't it permissible at the very least for some persons to judge that B1 is true? They have the relevant robust intuitions and have no available defeaters.
You might say that that's about practical deliberation. It is. Consider the following piece of theoretical deliberation:
B1: God told me to engage in acts of terrorism.
B2: If God told me to engage in acts of terrorism, I ought to engage in acts of terrorism.
B3: I ought to engage in acts of terrorism.
Unlike the previous piece of reasoning, this deliberation concludes with a belief about what ought to be done rather than an action. (Nothing turns on whether Ari was right that PD concludes with action.) Again, you know that B2 is true. So, it seems either you oughtn't conclude that B3 is true and so oughtn't hold B1 or you may hold B1 and so may conclude that B3 is true. (The 'may' here means permissible.) Presumably, Huemer has to say that you are permitted to judge that B1 is true if you have the right psychological profile. I can't see how he can sensibly then say that you are not permitted to hold B3. If you want to resist condoning the acts of the terrorist as being justified, you have to say that the following principle is false:
(L) You oughtn't both: judge that you ought to A and refrain from A-ing.
Now, you mention Huemer's arguments for PC. Among those arguments is an argument that obligations are all rationally identifiable as such by those who are under them. (That's from the APQ article.) Question: what about (L)?
____
There was also an issue of interpretation. When I said that I did not think that your special case of (PC) was a special case, what I meant to say is that the content of an appearance state was likely not going to have the following sort of Russellian content:
Similarly, I doubt there will be appearance states of the relevant kind that have contents such as _being a battleship_, _being from Jerusalem_, or _being John Malkovich_. So, I suspect that the justification for believing that God is speaking to you won't be basic or non-inferential. That's all.
Here's a link to the paper you were asking about. It's the short version I'll be presenting tomorrow,
C
Mike: No one has reason to take PC seriously as a epistemological principle unless he has an antecedent commitment to the view that our world is not a brain-in-vat world, for instance.
But we do have an antecedent commitment that we're not in a BIV world. This commitment is displayed every time we trust our senses as giving us reliable information about the world.
Perhaps you think this antecedent commitment requires prior evidential justification. Perhaps you think that we need positive evidence for thinking that we're not in a BIV world before we are entitled to employ PC. If so, then I think you're asking for something that simply can't be had. But what's your reason for thinking that we need this kind of antecedent justification? That's a substantive epistemological assumption for which you have given no argument.
Anyway, the reason for preferring PC to PL is not evidential but methodological. The only possible way we could have positive evidence for anything whatsoever is on the assumption that undefeated appearances are provisional guides to how things are. What else could constitute positive evidence? It is not contrary to theoretical reason to start out by trusting the appearances. It is self-stultifying, and therefore contrary to practical reason, to insist that appearances have to be independently ratified before we trust any of them.
The fundamental disagreement here, Mike, is that you take it that we need to refute skepticism, whereas I, Andrew, John Greco, and others think it sufficient to rebut the skeptic, to show that the skeptical arguments rely on assumptions that we non-skeptics are not rationally compelled to grant. Skepticism, we maintain, should not get a free pass as the default position.
The fundamental disagreement here, Mike, is that you take it that we need to refute skepticism, whereas I, Andrew, John Greco, and others think it sufficient to rebut the skeptic
Alan,
Very clear, here. I do not claim (and I hope I didn't suggest) that we need a refutation of skepticism. I'm entirely happy with a rebuttal. I'm entirely happy with reaching the conclusion that we have, on balance, better reason to believe we are not in a BIV world than that we are in one. What we disagree about is what constitutes a rebuttal. I don't think it constitutes a rebuttal to advance the view that,
...the skeptical arguments rely on assumptions that we non-skeptics are not rationally compelled to grant.
I think that amounts to changing the rationality rules. I guess where we disagree is that I do not take the methodological question as being epistemically different from the evidential question.
But you ask,
But what's your reason for thinking that we need this kind of antecedent justification? That's a substantive epistemological assumption for which you have given no argument.
My reason is really quite plain. In EVERY other case in which we have the same amount of evidence for P as we have for ~P, we rule that we should suspend judgment. BUT, in the particular case of the skeptical challenge, you want to change the rationality rules. Ok. But I think I can insist, at the very least, on consistency. Consistency about rationality commits you to holding that, in cases where there is a .5 chance heads and .5 chance tails, it is perfectly reasonable to pay $10.00 for the gamble [.5($15.00) if heads; $(0) if tails], (change the exact numbers a little, if you like). And, as any rational person can see, you'll be taken to the cleaners in no time; but by your lights, you'll be perfectly rational. That's close to a reductio, as far as I can see.
Anyway, the reason for preferring PC to PL is not evidential but methodological. The only possible way we could have positive evidence for anything whatsoever is on the assumption that undefeated appearances are provisional guides to how things are. What else could constitute positive evidence? It is not contrary to theoretical reason to start out by trusting the appearances. It is self-stultifying, and therefore contrary to practical reason, to insist that appearances have to be independently ratified before we trust any of them.
Alan, I had a question. Suppose you believe E = K. Can you consistently combine that with the further view that, "The only possible way we could have positive evidence for anything whatsoever is on the assumption that undefeated appearances are provisional guides to how things are. What else could constitute positive evidence?"
That's a counterexample? It looks more like an assertion. I wish skepticism about perception were that simple to refute.
If I can know anything without knowing that I'm not a brain in a vat, I thought it would be my own existence. I don't know that I exist on the basis of perception, so I wasn't trying to refute skepticism about perception. Anyway, both cases I gave seem to me to be clear, intuitive cases of justified belief. The intuitions are as clear and plausible to me as my intuitions about any other case in philosophy (Gettier cases, cases of causation, whatever).
Mike: In EVERY other case in which we have the same amount of evidence for P as we have for ~P, we rule that we should suspend judgment.
I don't think that Cliffordian principle is right, for roughly the kinds of reasons William James gives in "The Will to Believe". If practical rationality made no claims on us, then I would agree, we should suspend judgment. But the question of whether to provisionally trust the appearances or not is a genuine option in the Jamesian sense. We've got to act either as if PC is true or as if something like PL is true. Practically speaking, we can't sit it out until decisive evidence comes in one way or the other.
Mike: Consistency about rationality commits you to holding that, in cases where there is a .5 chance heads and .5 chance tails, it is perfectly reasonable to pay $10.00 for the gamble [.5($15.00) if heads; $(0) if tails], (change the exact numbers a little, if you like).
Huh? I don't see why you think I'm committed to a Dutch Book betting arrangement like this. Expected values depend on both probabilities and payoffs. Suppose the probabilities of PC and PL are each .5. It is still rational to bet on PC if it seems like it would yield a higher payoff. How much it would be rational to bet depends on the payoff ratio. I submit that PC makes possible a much higher epistemic payoff than PL.
Hi Clayton,
I'm not really sure what to say in response to your question except that I don't find the E=K thesis all that plausible. It looks like a confusion of categories to me.
Perhaps what you're asking is whether we could replace "evidence" with "knowledge" in the sentence you quoted from me. The resulting sentence does look plausible to me, with the exception of the adjective "positive". I'm not sure what "positive knowledge" comes to.
Alan,
I don't accept E = K. (I do, however, think that non-inferential knowledge of the truth of p suffices for p's inclusion in your evidence and that the truth of p is necessary for p to constitute evidence. That's sort of a distraction but you might think we ought to deny one of these.) The reason I asked whether you took your remarks to be compatible with E = K is this.
You might think that:
(1) E = K is incompatible with the sort of principle the phenomenal conservative endorses.
I'd then note that:
(2) E = K provides an account of what constitutes "provisional guides to how things are" because it gives us an account of evidence.
The upshot would be that your remarks couldn't provide much support for the phenomenal conservative's view since the sort of platitudes you seem to think we cannot sensibly deny would appear on a reading to be compatible with E = K. (On readings where your remarks were not compatible with E = K, they wouldn't be platitudes we would be unreasonable to reject. Your remarks could be correct, but they'd be controversial and in need of some sort of defense. That defense would, inter alia, have to show that E = K is false.)
So, short version. What else besides appearances could provide evidence? The propositions we know to be true when we take appearances at face value and learn how things are. You said, "It is self-stultifying, and therefore contrary to practical reason, to insist that appearances have to be independently ratified before we trust any of them". That may be, but if you think that non-inferential knowledge of p's truth suffices for p's inclusion in your evidence and think that p's truth is necessary for p's status as a genuine normative reason/evidence, we can say that our evidence doesn't consist of appearances without adopting the silly view you (perhaps rightly) regard as self-stultifying.
Huh? I don't see why you think I'm committed to a Dutch Book betting arrangement like this. Expected values depend on both probabilities and payoffs. Suppose the probabilities of PC and PL are each .5. It is still rational to bet on PC if it seems like it would yield a higher payoff.
Let me spell out the problem. You have as much evidence that PC is true as you have that PL is true. Still, you seem to believ saying it is more theoretically rational (t-rational) to believe PC is true (or at least theoretically rational to believe PC is true rather than PL). Of course, I'd say that this is totally t-irrational. These options are equally probable, it is not more t-rational to believe that one of them is true rather than the other. If you really believed it is more t-rational to believe PC is true, this would be displayed in your betting behavior. You would be willing to pay slightly more than .50 for a .5 chance at PC being true = $1. Suppose God offered you the bet. If you believe it is more t-rational to believe PC is true, then He offers you the bet: .55 for a gamble [.5(PC) = $1; .5 (tails) = 0], and you can expect to lose. If you refuse the bet (or one very similar), then you don't genuinely believe it's more t-rational to believe PC is true. My guess is that you'd refuse the bet.
Alan,
Perhaps there's a shorter way to put this, if you'll allow me to talk about credences. You put greater credence (Cr) in PC than you do in PL, despite the fact that the chances that one of them is true is no greater than the chances that the other is true. Obviously, you should find it rational to bet more on those things that you find more credible, other things being equal. Since your Cr(PC) is greater than Cr(PL), then if the value of PC = PL (say, each pays $1 if true), then you should be willing to wager more on PC being true. (example: if Cr(Heads) = .6, Cr(tails) = .4, V(heads) = V(tails) = $1, then it is rational for you to bet .60 on heads, but not on tails.). But since your credences do not match the chances, you are bound to lose. Similarly in the case of PC and PL. You have a greater credence for PC despite the fact that there is no greater evidence for it than for PL. We can show that this is irrational by letting God set the bet for you between PC and PL, with equal value for each if true.
Mike,
Thanks for spelling your Dutch Book argument out for me. I don't think it sticks against me, however, because I grant you that PC and PL are on par as far as theoretical rationality goes. If I gave you some impression otherwise, that was not my intent.
What I've been arguing is that PC and PL are not on par with respect to practical rationality. When the question concerns epistemic responsibility, namely, how we ought to conduct inquiry so as to put ourselves in the best position (as far as we can tell) for obtaining truth and avoiding error, PC wins hands down.
. . . [A] When the question concerns epistemic responsibility, namely, how we ought to conduct inquiry so as to put ourselves in the best position (as far as we can tell) for obtaining truth and avoiding error, PC wins hands down
The thread is getting long, and I'm not sure it's worth pursuing, but we've reached a point where we agree that PC and PL are equally supported by the evidence. Since you do not know, theoretically, that our world is a PC world, I don't know how you could believe [A]. If I'm a BIV, then I know more by believing that what appears to be the case is in general not the case. In BIV worlds, my knowledge increases by believing that the 'perceptions' are merely artificially generated. In BIV worlds, I do not know more by believing that the perceptions are prima facie evidence for what is genuinely there. So, how much I come to know about the world by adhering to PC (or PL) depends on which world I happen to be in. Since I do not know what world I'm in, there is no obvious epistemic reason to opt for PC over PL.
Clayton,
When you said, "When I said that I did not think that your special case of (PC) was a special case, what I meant to say is that the content of an appearance state was likely not going to have the following sort of Russellian content:" was there supposed to be something that came after? I think you may have forgotten to put something there.
(Also, another quick note is that Huemer doesn't think his view applies only to basic beliefs (which he originally thought). He says this in both the APQ and PPR articles.)
Hey Andrew,
Yes, there was supposed to be a proposition there, but I think when I enclosed it within ' [God, F-ness]
H's account should apply to all beliefs, but if we are going to focus on the inferential justification for believing that God is speaking to me, I can't see that any view can simply rule out the possibility of that belief's being justified. I thought the interest in H's account stemmed from the promise that the basic beliefs could be justified and I thought that there would have to be an appropriate appearance state for such beliefs. It seemed a stretch to say that there would be such a state.
Clayton,
I don't see why it would be a stretch. Let me consider one of your examples. Suppose I get a good look at a person, and it seems to me that that person is John Malkovich. Given that there are no defeaters, that belief would be justified according to (PC). I don't see anything odd about that.
I'm not sure whether that belief counts as basic or not. (Fales has a nice discussion of whether these sorts of beliefs count as basic in his PPR 2004 article, I think entitled "Proper Basicality".) But that doesn't really matter since, as we agree, Huemer wants his view to cover both basic and nonbasic beliefs. And regardless of its status as basic or not, it seems to me that beliefs about God's speaking (on the basis of its seeming that God said X) aren't any more problematic than the above example (which doesn't seem to me to be problematic).
I think you might think that the problem is about interpretation of Huemer and whether he would allow such cases to count as genuine appearance or seeming states. Is that right? But given how generous he is w/counting states as appearance states (memorial, introspective, intuitions), it seems that all that is required for a person to be in an appearance state with p as its content is for it to seem to the person that p.