By physical liberty I mean the right to do anything which does not interfere with the happiness of another. By intellectual liberty I mean the right to think and the right to think wrong.

To give up your individuality is to annihilate yourself.

There is no slavery but ignorance.

It has always seemed to me that a being coming from another world, with a message of infinite importance to mankind, should at least have verified that message by his own signature. Is it not wonderful that not one word was written by Christ?

Temptations are as thick as the leaves of the forest, and no one can be out of the reach of temptation unless he is dead. The great thing is to make people intelligent enough and strong enough, not to keep away from temptation, but to resist it.

I have made up my mind that if there is a God, he will be merciful to the merciful. Upon that rock I stand. That he will not torture the forgiving. Upon that rock I stand. That every man should be true to himself, and that there is no world, no star in which honesty is a crime. Upon that rock I stand.

I believe in the religion of reason -- the gospel of this world; in the development of the mind, in the accumulation of intellectual wealth, to the end that man may free himself from superstitious fear, to the end that he may take advantage of the forces of nature to feed and clothe the world.