"I think, if anything, my children are the ones who have sacrificed because I've had to too many times be absent from them. But, at the same time, they have lived very enriched lives and probably experienced things they wouldn't have if not for the movements. So, there are some rewards."

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Kripke says that physicalists like me can't explain the 'apparent contingency' of mind-brain identities. He maintains that, if I really believed that pains are C-fibres, then I ought no longer to have any room for the thought that 'they' might come apart. His argument is that, since pains aren't identified via some contingent description, but in terms of how they feel, I have no good way of constructing a possible world, so to speak, where C-fibres are present yet pains absent.

— David Papineau