can locke's concept of personal identity make survival after death possible rationally?

Can we survive death? Most of us fear death partly because we will not be there to experience

what comes after. But that assumption presupposes that we know what “we” are, and that we

understand what it would mean for us to survive or not survive. Many of us hope to survive

death in some form, that some part of us will persist after the body dies. John Locke argued that

personal identity consists of consciousness mediated by memory. This view seems to open the

door to survival, if a being in the afterlife remembers your life, then on Locke's account, that

being is you.

I argue that Locke’s memory based account of personal identity cannot rationally ground the possibility of survival after death: real memory requires a causal chain that death destroys, and even if God could reconstruct that chain, the duplication argument shows that memory continuity alone cannot deliver the numerical identity that survival requires.

Before I evaluate Locke's account, I need to be clear about what survival would actually mean.

Weirob, in Perry's dialogue, makes a simple but crucial point: survival is not similarity, it is

numerical identity. If a being exists after my death who has all my memories and psychological

traits, that being is not me unless it is literally one and the same person. She also says it means

there will be someone in the future who will think and feel and remember, and that person will

be me, related to me in such a way that I can now correctly anticipate her future experiences as

mine. Only identity supports genuine anticipation. Similarity, however exact, does not. Nagel

makes this distinction precisely. He writes that even if a person's body were frozen after death and later revived by advanced medical technology, there would still be a genuine question: is the

person who woke up you, or just someone very like you? So when I ask whether Locke can

make survival coherent, I am asking whether his account can guarantee that the future person is

numerically identical to me, not merely similar. Two identical twins are qualitatively alike, but

they are two different people. This is the standard I will hold Locke to.

Locke's account of personal identity appears, at first, to give us exactly what we need. For

Locke, personal identity does not consist in bodily continuity(the living organism) or in the

persistence of a soul (which Locke is agnostic about). It consists in continuity of consciousness,

extending backward through memory and forward through anticipation of reward/punishment.

You are the contents of your mind. I am the same person as a child who stole an apple if I

remember being that child and doing it as my own experience. Locke illustrates this with the

Prince and Cobbler case: when the prince's consciousness, all his memories and experiences,

moves into the cobbler's body, the person goes with the consciousness, not with the body. This

matters for survival. It means personal identity is not tied to the biological body. Then death ends

the body, but not necessarily the person. So, in principle, if a being after death remembers your

experiences is, on this account, you. Personal identity has crossed the boundary of death.

But it faces a deep problem. The problem is that we cannot simply say that having someone's

memories is enough to be that person. We need to distinguish real memory from apparent

memory (false memories). Perry's hypnosis case shows this problem. Imagine two people both

"remember" the same conversation: one genuinely, one via post-hypnotic suggestion. Their qualitatively identical memory-states about the same experience. The only difference is

relational: one actually had the experience, the other did not. A hypnotised person sincerely

reports the memory, and their report is identical in content to a genuine one. What separates real

memory from apparent memory? The natural answer is that the real rememberer is the person

who actually had the original experience, that is, the person who is identical with the one who

had it. But this reasoning is circular. If we already need personal identity to identify genuine

memories as "a memory of what happened to me", then memory cannot be what constitutes

personal identity. This is Butler's objection, You cannot use memory to explain identity if identity

is already doing work in defining real memory.

Derek Parfit offers a solution. A real memory is not defined by what happened to me, but it was

caused in the right information-preserving way by the original experience. You trace the causal

origin of the memory back to the event, without appealing to identity at all. The hypnotized

person's apparent memory was caused by a suggestion, not by the event itself. The genuine

rememberer's memory traces causally back to that event. But causal repair creates a new and

more serious problem for survival. If real memory requires a causal chain running back to the

original experience, we need to ask what that chain runs through?

This is where death creates a fatal problem for the account. In every ordinary case, the causal

chain linking your current memories to your past experiences runs through your brain and

nervous system. Nagel notes that all available evidence before death shows conscious life

depends entirely on what happens in the nervous system. We have no evidence from ordinary observation, as opposed to religious faith, that mental life can persist independently of brain

function. Death permanently destroys brain function. Any being that exists after my death has no

real causal connection to your original experiences. Its memories, however vivid, are “apparent

memories” in exactly Parfit's sense: they were not caused in the right way by the original

experience. The causal repair, far from saving the memory theory for survival, actually makes

the case against it sharper. A post-death being with your apparent memories is not you, because

their memories were not caused in the right way.

Consider the prince/cobbler example again, Prince suffers brain death and the doctor removes his brain and places it in cobbler’s body. The survivor has Prince’s memories, personality and all

beliefs. One would say the survivor is Prince, because the memories are causally continuous with

his experiences. But another could object that the survivor can also not be Prince, as it seems to

remember being prince, but it is not the same as remembering. Also Should Prince stop

anticipating the body’s experiences? Should she refuse the aspirin that will prevent the survivor's

headache?

The strongest objection to this argument runs as follows. Could God supernaturally restore the

causal chain? Suppose God creates a being in the afterlife whose mental states were caused, in an information-preserving way, by your brain states at the moment of death. The causal chain is

unusual, but it is intact. Miller makes precisely this move in Perry's dialogue. On Parfit's causal

criterion, the requirement would be satisfied: the heavenly being's memories were genuinely

caused by your experiences. So survival remains possible, unusual in mechanism, but coherent

in principle.

The objection fails. Here is why!

If God can do this for one being, he can do it for two or ten. He creates two beings in heaven, both equally and fully causally continuous with you. Each would satisfy Parfit's causal criterion equally. Each would have an identical causal claim to your experiences. In theory, both are you. But identity cannot hold between one person and two. This follows from the basic logic of identity: if A = B and A = C, then B = C, but two numerically distinct beings cannot both be you.8 We have a contradiction. So either one being you, but why favour one over the other? Or both are you but B ≠ C, or neither being is you. The memory theory, even with the causal repair, cannot tell us which of the duplicates is the real survivor, because they are indistinguishable by the theory's own criteria.

As Parfit points: why should double success be failure? Weirob shows: If the existence of a

second being afterlife would undermine the first being's claim to be her, then the first being was

never her in virtue of memory continuity alone.10 Identity either holds or it does not,

independently of whether God happens to create one copy or two. If memory continuity can in

principle be satisfied by two beings simultaneously, then it is a different relation from numerical

identity, which by definition can only hold between a thing and itself. Memory continuity is

therefore not sufficient for numerical identity. Since survival requires numerical identity, Locke's

memory theory, even repaired with causal continuity, cannot provide rational grounds for believing you survive.

The argument can be summarised as follows. Locke's memory theory makes survival seem

conceivable: if memory constitutes personal identity, and memory can persist after death, then so can persons. But real memory requires the right causal origin, and death permanently destroys the brain, which is the only causal basis we have evidence for, so any post-death memories would be merely apparent, not real. Even granting divine intervention to restore a causal chain, the theory still cannot deliver numerical identity; because anything that satisfies memory continuity can, in principle, be duplicated, and duplication is incompatible with identity.

We may have reasons to believe in survival after death. This is a modest conclusion. It does not show that there is no afterlife, or death is good or evil, It just shows Locke's memory theory does not give us rational grounds to believe we, numerically, can survive death