David Hume — "The corruption of the best things produces the worst."

"If we would satisfy ourselves, therefore, concerning the nature of that evidence, which assures us of matters of fact, we must enquire how we arrive at the knowledge of cause and effect."

"The elegant part of mankind, who are not addicted to the severer sciences, may here find entertainment, and perhaps instruction."

"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."

"To be a philosophical sceptic is the first and most essential step towards being a sound, believing Christian."

"The good of mankind is the only object of moral consideration."