“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.”

“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.”

“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.”

“It is a contradiction in terms and ideas, to call anything a revelation that comes to us at second-hand, either verbally or in writing. Revelation is necessarily limited to the first communication; after this, it is only an account of something which that person says was a revelation made to him; and though he may find himself obliged to believe it, it cannot be incumbent on me to believe it in the same manner; for it was not a revelation made to me, and I have only his word for it that it was made to him.”

“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.”

“What are the present governments of Europe, but a scene of iniquity and oppression? What is that of England? Do not its own inhabitants say, It is a market where every man has his price, and where corruption is common traffic, at the expense of a deluded people? No wonder, then, that the French Revolution is traduced.”