I don't think that free will can be reconciled with purely deterministic physics - free will implies that, in exactly the same situation, with each and every particle in exactly the same space, I can still choose whether to purchase those biscuits or not.
On the other hand, my decision whether or not to purchase those biscuits is not exactly random, either. There are a number of factors that go into it - in fact, considering force of habit, quite a few of my decisions are extremely predictable. So I'm not sure that random physics is entirely reconcilable either.
OK. So, do you consider that you actually have good evidence for the existence of free will in this sense? If so, what is that evidence?
The obvious alternative hypothesis, which seems to me to explain all the evidence I know of just as well, is that at the level of physics there's nothing but determinism and maybe randomness, but it looks different to us because we can't see all the details. We think "I could have done otherwise in the exact same situation" because we have seen ourselves and others do different things in very similar-looking situ...
Another month, another rationality quotes thread. The rules are: