David Hume — "All knowledge degenerates into probability."

"Some exalt our species to the skies, and represent man as a kind of human demigod, who derives his origin from heaven, and retains evident marks of his lineage and descent. Others insist upon the blin…"

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

"The most perfect happiness consists in the most perfect activity."

"The most perfect philosophy of the natural kind only staves off our ignorance a little longer."

"We make allowance for a certain degree of selfishness in men; because we know it to be inseparable from human nature, and inherent in our frame and constitution."