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.
No man is sane who does not know how to be insane on proper occasions.
What frightens us most in a madman is his sane conversation.
Show me a sane man and I will cure him for you.
In a mad world, only the mad are sane.
What sane person could live in this world and not be crazy?
Sanity is a madness put to good uses; waking life is a dream controlled.
An asylum for the sane would be empty in America.