It is hard to overstate the debt we owe to the men and women of genius.

As long as a man lives he should study. Death alone has the right to dismiss the school.

The priests of one religion never credit the miracles of another religion. Is this because priests instinctively know priests?

Just to the extent that the Bible was appealed to in matters of science, science was retarded; and just to the extent that science has been appealed to in matters of religion, religion has advanced - so that now the object of intelligent religionists is to adopt a creed that will bear the test and criticism of science.

Liberty is the breath of progress.

Custom meets us at the cradle and leaves us only at the tomb.

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... In the New Testament, death is not the end, but the beginning of punishment that has no end. In the New Testament the malice of God is infinite and the hunger of his revenge eternal... This frightful dogma, this infinite lie, made me the implacable enemy of Christianity. The truth is that this belief in eternal pain has been the real persecutor.