Nullum magnum ingenium sine mixtura dementiae fuit.
There has been no great genius without an element of madness.
Well that probably depends on what you think is mad. People probably thought Copernicus was mad to speculate that the sun was the center of the solar system.
It would be a difficult call to make, that is, what the author meant, especially given not only the difference in language, but the difference in times . . . .