"Reason is, and ought only to be the slave of the passions, and can never pretend to any other office than to serve and obey them."

"For my part, when I enter most intimately into what I call myself, I always stumble on some particular perception or other, of heat or cold, light or shade, love or hatred, pain or pleasure. I never c…"

"The greater part of mankind are more governed by interest than by reason."

"The general maxims of morality are insufficient to determine us to action."

"All knowledge degenerates into probability."