No excellent soul is exempt from a mixture of madness.

There was never a genius without a tincture of madness.

He who not being inspired and having no touch of madness in his soul comes to the door and thinkshe will get into the temple by the help of art - he, I say, and his poetry are not admitted.

No great mind has ever existed without a touch of madness.

Friendship is a single soul dwelling in two bodies.

To the query, ''What is a friend?'' his reply was ''A single soul dwelling in two bodies.''