"All knowledge degenerates into probability."

"A certain proof that men ever did, and ever will derive their religion from other sources than this species of reasoning."

"It is an infallible maxim, that no man was ever attached to the present order of things, who did not hope to profit by it."

"The most perfect philosophy of the natural kind is of little use to us, if it do not enable us to correct our errors, and regulate our passions."

"The chief cause of human error is to be found in the prejudice of the imagination."