Life is like a sewer. What you get out of it depends on what you put in to it.
Source: Preamble to song: We Will All Go Together When We Go
-- Tom Lehrer, (Apr 9 1928-____), US parody/folk singer, songwriter, mathematician; He was a professor of Math at Harvard who wrote many satirical tunes (Poisioning Pigeons) in the 1960s; appeared on That Was The Week That Was.