"I am a mathematician and a logician. I have no emotions. I am a machine. I am a machine to think."

"In many women, especially rich Society women, the capacity for feeling love is completely dried up, and is replaced by a powerful desire that all men should love them."

"Men are born ignorant, not stupid; they are made stupid by education."

"I say quite deliberately that the Christian religion, as organized in its churches, has been and still is the principal enemy of moral progress in the world."

"It is possible that mankind is on the threshold of a golden age; but, if so, it will be necessary to kill off nine-tenths of the present population."