“I have always strenuously supported the right of every man to his own opinion, however different that opinion might be to mine. He who denies to another this right, makes a slave of himself to his present opinion, because he precludes himself the right of changing it.”

“The circumstances of the world are continually changing, and the opinions of men change also,Government is for the living, and not for the dead; it is the living only that has any right in it.”

“For all men being originally equals, no one by birth could have the right to set up his own family in perpetual preference to all others forever, and tho' himself might deserve some decent degree of honours of his cotemporaries, yet his descendants might be far too unworthy to inherit them.”

“He that would make his own liberty secure must guard even his enemy from oppression; for if he violates this duty he establishes a precedent that will reach to himself.”

“Whatever is my right as a man is also the right of another; and it becomes my duty to guarantee as well as to possess.”

“When I hear another express an opinion which is not mine, I say to myself, he has a right to his opinion, as I to mine. Why should I question it? His error does me no injury, and shall I become a Don Quixote, to bring all men by force of argument to one opinion? ...Be a listener only, keep within yourself, and endeavor to establish with yourself the habit of silence, especially in politics.”

“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.”