God ever geometrizes.

The philosopher is in love with truth, that is, not with the changing world of sensation, which is the object of opinion, but with the unchanging reality which is the object of knowledge.

You may be sure, dear Crito, that inaccurate language is not only in itself a mistake: it implants evil in men's souls.

The ludicrous state of solid geometry made me pass over this branch.

Mankind censure injustice fearing that they may be the victims of it, and not because they shrink from committing it.

Honesty is for the most par less profitable than dishonesty.

'But the man who is ready to taste every form of knowledge, is glad to learn and never satisfied - he's the man who deserves to be called a philosopher, isn't he?'