Commerce is the great civilizer.

Every church that has a standard higher than human welfare is dangerous.

This crime called blasphemy was invented by priests for the purpose of defending doctrines not able to take care of themselves.

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.

God cannot send to eternal pain a man who has done something toward improving the condition of his fellow-man. If he can, I had rather go to hell than to heaven and keep company with such a god.

Arguments cannot be answered with insults. . . . Kindness is strength. . . . Anger blows out the lamp of the mind. In the examination of a great and important question, every one should be serene, slow-pulsed, and calm.

If the reason I give is a good one, you will act upon it. If it is a bad one I cannot make it better by piling epithet upon epithet. There is no logic in abuse; there is no argument in an epithet.