To marry unequally is to suffer equally.

Self-interest is but the survival of the animal in us. Humanity only begins for man with self-surrender.

A lively, disinterested, persistent liking for truth is extraordinarily rare. Action and faith enslave thought, both of them in order not to be troubled or inconvenienced by reflection, criticism or doubt.

I'm not interested in age. People who tell me their age are silly. You're as old as you feel.

Thought is a kind of opium; it can intoxicate us, while still broad awake; it can make transparent the mountains and everything that exists.

Truth is not only violated by falsehood; it may be equally outraged by silence