Paul Carus 
Nietzsche 

A perfect crystal is rare; so the perfectly normal man is an exception; yet for all that he is a better representative of the ideal of his type than the average. Nietzsche was most assuredly very ingenious; he was unusually talented but he was not a genius in the full sense of the word. He was abnormal, titanic in his pretensions and aims, and erratic. Breaking down under the burden of his own thought, he ended his tragical career in an insane asylum…