Religion supports nobody. It has to be supported. It produces no wheat, no corn; it ploughs no land; it fells no forests. It is a perpetual mendicant. It lives on the labors of others, and then has the arrogance to pretend that it supports the giver.

Too much doubt is better than too much credulity.

The man who invented the telescope found out more about heaven than the closed eyes of prayer ever discovered.

I would have all the professors in colleges, all the teachers in schools of every kind, including those in Sunday schools, agree that they would teach only what they know, that they would not palm off guesses as demonstrated truths.

It seems to me impossible for a civilized man to love or worship, or respect the God of the Old Testament. A really civilized man, a really civilized woman, must hold such a God in abhorrence and contempt.

We are not accountable for the sins of "Adam".

I do not believe in loving enemies; I have pretty hard work to love my friends. Neither do I believe in revenge. No man can afford to keep the viper of revenge in his heart. But I believe in justice, in self-defense.