Originally Posted by The Batlord

Well, yeah. Aside from math you can't actually prove anything. That's just the nature of science and the world in general. In the strict sense of the word you can't actually "know" much of anything. You can be sure beyond a reasonable doubt, but that's not the same thing as knowing something.

And just because you can't prove a negative (at least not a vague negative like that) doesn't mean you can make a claim and not have to prove it. If you claim that reincarnation doesn't exist you have to back it up.