Who can over estimate the progress of the world if all the money wasted in superstition could be used to enlighten, elevate and civilize mankind?

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.

Labor is the only prayer that Nature answers: It is the only prayer that deserves an answer—good, honest, noble work.

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.

In the republic of mediocrity, genius is dangerous.

Only those who live on the labor of the ignorant are the enemies of science. Real love and real religion are in no danger from science. The more we know the safer all good things are.

The ideas of right and wrong change with the experience of the race, and this change is wrought by the gradual ascertaining of consequences - of results.