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I am not a madman or a nut.

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.

It takes madness to find out madness.

Possibly he knew, as he wrote this, that he was mad - because inside every madman sits a little sane man saying 'You're mad, you're mad.'

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

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