“It is necessary to the happiness of man that he be mentally faithful to himself. Infidelity does not consist in believing, or in disbelieving, it consists in professing to believe what he does not believe.”

“Infidelity does not consist in believing, or in disbelieving; it consists in professing to believe what he does not believe. It is impossible to calculate the moral mischief, if I may so express it, that mental lying has produced in society. When a man has so far corrupted and prostituted the chastity of his mind, as to subscribe his professional belief to things he does not believe, he has prepared himself for the commission of every other crime.”

“I believe in the equality of man, and I believe that religious duties consist of doing justice, loving mercy, and endeavoring to make our fellow-creatures happy.”

“I believe in one God, and no more; and I hope for happiness beyond this life. I believe in the equality of humans; and I believe that religious duties consist in doing justice, loving mercy, and endeavoring to make our fellow creatures happy.”

“If I do not believe as you believe, it proves that you do not believe as I believe, and that is all that it proves.”

“To believe that God created a plurality of worlds, at least as numerous as what we call stars, renders the Christian faith at once little and ridiculous; and scatters it in the mind like feathers in the air.”

“It is only by the exercise of reason that man can discover God. Take away that reason, and he would be incapable of understanding anything; and, in this case, it would be just as consistent to read even the book called the Bible to a horse as to a man. How, then, is it that those people pretend to reject reason?”