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There is only one difference between a madman and me. The madman thinks he is sane. I know I am mad.

Men are so necessarily mad, that not to be mad would amount to another form of madness.

'Mad' is a term we use to describe a man who is obsessed with one idea and nothing else.

One is always considered mad, when one discovers something that others cannot grasp.

There is a pleasure in being mad which none but madmen know.

Only the madman is absolutely sure.

Some deemed him wondrous wise, and some believed him mad.