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I'm not a madman.

The only difference between me and a madman is that I'm not mad.

There is only one difference between a madman and me. I am not mad.

What frightens us most in a madman is his sane conversation.

You're only given a little spark of madness. You mustn't lose it.

It takes madness to find out madness.

The genius which runs to madness is no longer genius.

We must not contradict, but instruct him that contradicts us; for a madman is not cured by another running mad also.