Here are three extremely plausible propositions that cannot all be true:
1) A wholly past (felt) pain is not nothing: it is real.
2) For (felt) pains, esse est percipi, to be is to be perceived.
3) Wholly past (felt) pains are not perceived.
Ad (1): To say that an item is wholly past is to say that it does not overlap the present. A felt or phenomenal pain is a pain exactly as it is experienced from the first-person point of view of the one who endures it, with all and only the properties it appears to have from the point of view of the one who endures it. It is not to be confused with the physical cause of the pain if there is one. Now yesterday's excruciating migraine headache, which is wholly past, is not nothing: it happened. It is now an object of veridical memory. Since the memory is veridical, its intentional object cannot be unreal. The pain is also a subject of presently true past-tensed statements such as 'The pain was awful.' Given that veritas sequitur esse, that no true statement is about what is wholly unreal or nonexistent, yesterday's migraine pain cannot be unreal or nonexistent. The remembered wholly past pain is actual not merely possible; factual not fictional; real not imaginary. Of course, it is not temporally present. But it is real nonetheless. It is or exists. It is included in the ontological inventory. To deny this is to deny the reality of the past.
Ad (2): The being or existence of a felt pain is just its being-perceived. A felt pain cannot exist apart from its being experienced. Again, it is not to be confused with an external, objective, physical cause of the pain sensation, if there is one. Esse est percipi is not true of the physical cause of the felt pain. But surely it is true of the pain precisely as it is endured from the first-person perspective of the one who endures it.
Ad (3): Yesterday's particular pains are over, and thank goodness: they are not being perceived or felt or experienced by anyone.
Each of these propositions is extremely plausible if not self-evident. Each is, or is very close to being, a Moorean fact, a datum, a given, something not reasonably denied. I myself am inclined to say that each of the limbs of the triad is true. But of course they cannot all be true on pain of logical contradiction. Any two limbs of the triad entail the negation of the remaining limb. For example, The conjunction of (1) and (2) entails the negation of (3). What we have here, then, is a paradigmatic philosophical problem: apparent data in logical conflict.
To avoid a logical contradiction, we must reject or revise one or more of the propositions in a principled way, i.e., by endorsing a theory that excludes the proposition. Here are four solution strategies:
A. Deny (1) by Adopting Presentism. This is the view that all and only what exists now, exists. This is not the tautology that all and only what exists now exists now, or exists in the present-tensed sense of 'exists.' It is a substantive (non-tautological) and highly controversial metaphysical thesis that restricts the ontological inventory to temporally present items. To avoid tautology, we can formulate it like this: all and only the temporally present exists simpliciter. (What exactly 'simpliciter' means here is of course part of the problem. Tenseless existence is presumably the best candidate for existence simpliciter.) Presentism entails that wholly past and wholly future items do not exist, are not real. So yesterday's pain does not exist simpliciter, and (1) is false. Problem solved. The past pain, being wholly past, is nothing at all. It is not just that it is now nothing at all -- which is a mere tautology given the standard meanings of 'past,' 'present,' and 'now' -- but that it is nothing at all, period!
But of course the problem is solved only if presentism makes sense and is true. And that is a big 'if.'
B. Deny (1) by Rejecting Veritas Sequitur Esse. 'JFK was assassinated' is past-tensed but presently true. It is true now that he was assassinated. But there are no truths about what does not exist. So I reason: since 'JFK was assassinated' is true, and is about JFK, he must (tenselessly) exist: wholly past items exist (are real, have being) despite being temporally non-present. You might resist my conclusion by making a Meinongian move: there are truths about beingless items and one can refer to such items. Even though JFK has ceased to exist, he is still in some sense available to serve as an object of reference and a subject of true statements.
C. Deny (2) by Adopting Materialism about the Mental. A token-token identity theorist will say that a particular pain episode is just a brain state. Now such a state, being wholly objective, can exist without being felt by anyone, in which case (2) is false. The eliminative materialist proposes a more radical solution: there are no mental states at all. Therefore, there are no felt pains and (2) is false.
D. Deny (3) by Adopting 'Eternalism.' This is a position in the philosophy of time entailed by the B-theory of time. The B-theorist denies that the present moment enjoys any temporal or existential privilege. All times and their occupants are both temporally and existentially equal. Every time is temporally present to itself such that no time is temporally present simpliciter. This temporal egalitarianism entails a decoupling of existence and temporal presentness. There just is no irreducible monadic mind-independent property of temporal presentness; hence existence cannot be identified with it. To exist is to exist tenselessly. The B-theory excludes presentism according to which there is a genuine, irreducible, property of temporal presentness and existence is either identical or logically equivalent to this property. Presentism implies that only the temporally present is real or existent. If to exist is to exist now, then the past and future do not exist, not just now (which is trivial) but at all. The B-theory leads to what is known in the trade as 'eternalism' according to which the catalog of what exists is not exhausted by present items, but includes past and future ones as well. See here for more.
If eternalism is true, then (3) above is false. The third limb of our antilogism states that past felt pains are not perceived. But if not perceived, then they do not exist. But on eternalism they do exist, tenselessly, whence it follows that yesterday's headache is tenselessly being perceived, whatever that might mean.
In a thorough discussion, I would then proceed to argue that each of these four attempts at a solution requires theories that are as problematic as the original problems. Once that case is made, a case will have been made that the above problem is an aporia in a strict sense, a problem that is fully intelligible and genuine, but insoluble by us.
Addendum (11/18)
Jonathan Barber writes,
I think you could distinguish between (a) the quale of pain (the raw sense data) and (b) the experience of pain – the mental effect produced by the raw sense data. Past qualia are not real - they simply do not exist. Past experiences are real. So in proposition 1 of your aporetic triad you are using 'pain' in sense (b), whereas in propositions 2 and 3 you are using 'pain' in sense (a).
Response. Barber's criticism, in terms I find more congenial, would go like this. There is a difference between a pain experience and its content, where the latter is the sensory quale. Past qualia are not real. Past experiences are real. 'Felt pain' in (1) refers to the experience whereas in 'felt pain' in (2) and (3) refer to the quale. I would say in response that while one can distinguish in thought between experience and quale, neither can exist in reality without the other. So if the past pain experience exists, then so does its qualitative content.
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