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"People have a right to believe whatever they like, including irrational beliefs. In fact, we all have irrational beliefs, in a certain sense. We have to. If I walk out the door, I have an irrational belief that the floor is there. Can I prove it? You know if I’m paying attention to it I see that it’s there, but I can’t prove it. In fact, if you’re a scientist, you don’t prove anything. The sciences don’t have proofs, what they have is surmises. There’s a lot of nonsense these days about evolution being just a theory. Everything’s just a theory, including classical physics! If you want proofs you go to arithmetic; in arithmetic you can prove things. But you stipulate the axioms. But in the sciences you’re trying to discover things, and the notion of proof doesn’t exist."