All religions are both harmful and untrue.

A good world needs knowledge, kindliness, and courage; it does not need a regretful hankering after the past or a fettering of the free intelligence by the words uttered long ago by ignorant men.

No satisfaction based upon self-deception is solid.

The Ten Commandments should be headed like an examination paper: No more than six to be attempted.

Most human beings, though in varying degrees, desire to control, not only their own lives but also the lives of others

The governors of the world believe, and have always believed, that virtue can only be taught by teaching falsehood, and that any man who knew the truth would be wicked. I disbelieve this, absolutely and entirely. I believe that love of truth is the basis of all real virtue, and that virtues based upon lies can only do harm.

Measures of sterilization should, in my opinion, be very definitely confined to persons who are mentally defective