Superstition is, always has been, and forever will be, the foe of progress, the enemy of education and the assassin of freedom.

For the most part we inherit our opinions. We are the heirs of habits and mental customs. Our beliefs, like the fashion of our garments, depend on where we were born. We are molded and fashioned by our surroundings.

[T]he blossom of benevolence, of charity, is the fairest flower, no matter whether it blooms by the side of a hovel, or bursts from a vine climbing the marble pillar of a palace. I respect no man because he is rich; I hold in contempt no man because he is poor.

Laughing has always been considered by theologians as a crime.

For thousands of years people have been trying to force other people to think their way. Did they succeed? No. Will they succeed? No. Why? Because brute force is not an argument.

I have not the slightest confidence in 'spiritual manifestations.'

Christianity has such a contemptible opinion of human nature that it does not believe a man can tell the truth unless frightened by a belief in god. No lower opinion of the human race has ever been expressed.