God: personified incomprehensibility.

I have remarked very clearly that I am often of one opinion when I am lying down and of another when I am standing up.

A writer who wishes to be read by posterity must not be averse to putting hints which might give rise to whole books, or ideas for learned discussions, in some corner of a chapter so that one should think he can afford to throw them away by the thousand.

After all, is our idea of God anything more than personified incomprehensibility?

The pleasures of the imagination are as it were only drawings and models which are played with by poor people who cannot afford the real thing.

So-called professional mathematicians have, in their reliance on the relative incapacity of the rest of mankind, acquired for themselves a reputation for profundity very similar to the reputation for sanctity possessed by theologians.

Honest unaffected distrust of human abilities under all circumstances is the surest sign of strength of mind.