"Fear is the main source of superstition, and one of the main sources of cruelty. To conquer fear is the beginning of wisdom."

"A good social system is not to be secured by making people unselfish, but, by making their own vital impulses fit in with other peoples."

"We civilised men do our utmost to check the process of elimination; we build asylums for the imbecile, the maimed, and the sick .... Thus the weak members of civilised societies propagate their kind. …"

"I hate the planet and the human race—I am ashamed to belong to such a species."

"I am an atheist, but I must confess that I am also a pantheist."