Rémy De Gourmont said this quote

He was a young man of savage & unexpected originality, a diseased genius & quite frankly, a mad genius. Imbeciles grow insane & in their insanity the imbecility remains stagnant or agitated; in the madness of a man of genius some genius often remains: the form & not the quality of intelligence has been affected; the fruit has been bruised in the fall, but has preserved all its perfume & all the savor of its pulp, hardly too ripe.