Some president wishes to be re-elected, and thereupon speaks about the Bible as "the corner-stone of American Liberty." This sentence is a mouth large enough to swallow any church, and from that time forward the religious people will be citing that remark of the politician to substantiate the inspiration of the Scriptures.

Whoever increases the sum of human joy, is a worshiper. He who adds to the sum of human misery, is a blasphemer.

This, in my judgment, is the highest philosophy: First, do not regret having lost yesterday; second, do not fear that you will lose tomorrow; third, enjoy today.

Too much doubt is better than too much credulity.

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

It is impossible for me to conceive of a character more utterly detestable than that of the Hebrew god.

Reason, observation, and experience; the holy trinity of science.