No great genius has ever existed without some touch of madness.

There is no genius without a mixture of madness.

There is no great genius without some touch of madness.

There is no genius free from some tincture of madness

Genius always gives its best at first; prudence, at last.

Nothing is so wretched or foolish as to anticipate misfortunes. What madness is it to be expecting evil before it comes.