An asylum for the sane would be empty in America.
In a mad world, only the mad are sane.
No man is sane who does not know how to be insane on proper occasions.
Sanity is a madness put to good uses; waking life is a dream controlled.
Sanity is the lot of those who are most obtuse, for lucidity destroys one's equilibrium: it is unhealthy to honestly endure the labors of the mind which incessantly contradict what they have just established.
Show me a sane man and I will cure him for you.
What frightens us most in a madman is his sane conversation.
What sane person could live in this world and not be crazy?