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There is no great genius without some touch of madness.

There was never a genius without a tincture of madness.

Genius is one of the many forms of insanity.

There's a fine line between genius and insanity, as we all know.

Real genius is nothing else but the supernatural virtue of humility in the domain of thought.

There's a fine line between genius and insanity. I have erased this line.

All genius is a conquering of chaos and mystery.

Genius must be born, and never can be taught.

Genius is nothing more than common faculties refined to a greater intensity. There are no astonishing ways of doing astonishing things. All astonishing things are done by ordinary materials.