Sacred are the lips from which has issued only truth.

Religion has not civilized man, man has civilized religion.

When your little child tells a lie, do not rush at him as though the world were about to go into bankruptcy. Be honest with him. A tyrant father will have liars for his children; do you know that? A lie is born of tyranny upon the one hand and weakness upon the other, and when you rush at a poor little boy with a club in your hand, of course he lies.

Reason is the light, the sun of the brain. It is the compass of the mind, the ever-constant Northern Star, the mountain peak that lifts itself above all clouds.

The savage prays to a stone that he calls a god, while the Christian prays to a god he calls a spirit, and the prayers of both are equally useful.

The myth of hell represents all the meanness, all the revenge, all the selfishness, all the cruelty, all the hatred, all the infamy of which the heart of man is capable.

The history of intellectual progress is written in the lives of infidels.