No man is sane who does not know how to be insane on the proper occasions."
Henry Ward Beecher

No man is sane who does not know how to be insane on the proper occasions.

One must be sane to think clearly, but one can think deeply and be quite insane.

The sole difference between myself and a madman is the fact that I am not mad!

Now this is the point. You fancy me a mad. Madmen know nothing. But you should have seen me. You should have seen how wisely I proceeded...

I mean, maybe I am crazy. I mean, maybe. But if this is all there is, then I don't want to be sane.