Find more pleasure in intelligent dissent than in passive agreement, for, if you value intelligence as you should, the former implies a deeper agreement than the latter.

My own belief is that in most ages and in most places obscure psychological forces led men to adopt systems involving quite unnecessary cruelty, and that this is still the case among the most civilized races at the present day.

But I simply can't stand a view limited to this earth, I feel life is so small unless it has windows into other worlds...I like mathematics largely because it is not human.

The Axiom of Choice is necessary to select a set from an infinite number of socks, but not an infinite number of shoes.

Conquer the world by intelligence, and not merely by being slavishly subdued by the terror that comes from it.

I can only say that, while my own opinions as to ethics do not satisfy me, other people's satisfy me still less.

When we have told how things behave when they are electrified, and under what circumstances they are electrified, we have told all there is to know