"It is a platitude that a man cannot be happy unless he is healthy."

"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."

"There is a great deal of difference between an open mind and an empty head."

"There is one very serious defect to my mind in Christ's moral character, and that is that He believed in hell. I do not myself feel that any person who is really profoundly humane can believe in everl…"

"The greatest happiness you can have is knowing that you do not need happiness."