PAIN, n. An uncomfortable frame of mind that may have a physical basis in something that is being done to the body, or may be purely mental, caused by the good fortune of another.
Source: The Devil's Dictionary, 1911.
-- Ambrose Bierce, (Jun 24 1842-1914), US journalist, short-story writer; He was a noted wit, satirist and sardonic short story writer who disappeared while covering the Mexican revolution.