There is no great genius without a touch of madness.
[Nullum magnum ingenium sine mixtura dementiae fuit.]Aristotle (384-322 BC) Greek philosopher
Attributed to Aristotle by Seneca the Younger, "On Tranquillity of Mind" (17.10).
"No excellent soul is exempt from a mixture of madness."
"No great genius has ever existed without some touch of madness." [tr. Basore (1932)]
"There is no great genius without a mixture of madness."
"There was never a genius without a tincture of madness."