David Hume — "The chief spring or actuating principle of the human mind is pleasure or pain."

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

"The great subverter of the universe, and of all systems of theology and moral philosophy, is the principle of ANARCHY."

"It is not from the benevolence of the butcher, the brewer, or the baker, that we expect our dinner, but from their regard to their own interest."

"The only method of freeing us from these abstruse questions, is to enquire seriously into the nature of human understanding, and show, from an exact analysis of its powers and capacities, that it is b…"

"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…"