"The weak and the ill-constituted shall perish: first principle of our philanthropy. And one shall help them to do so."

"And those who were seen dancing were thought to be insane by those who could not hear the music."

"Morality is the herd-instinct in the individual."

"What is great in man is that he is a bridge and not an end."

"The strongest and most evil spirits have so far advanced humanity the most: they have always rekindled the slumbering passions."