We are constantly railing against the passions; we ascribe to them all of man’s afflictions, and we forget that they are also the source of all his pleasures.

Denis Diderot (1713-1784) French editor, philosopher

Pensées Philosophiques [Philosophical Thoughts] (1746)

Alt. trans.: "One declaims endlessly against the passions; one imputes all of man's suffering to them. One forgets that they are also the source of all his pleasures."