But wait... here are some suggestions already. Oh dear.
"Life is nasty, brutish, and short. But down where it counts, I'm only nasty and brutish."
"A living thing seeks above all to discharge its strength"...know what I mean??
Hmmm... Remarkable on this evidence that the human race has succeeded in reproducing itself.
"Speaking generally, one might say that a relationship is a game in which a "cooperative" outcome obtainable only when every player violates rational self-interest is unanimously preferred to the "selfish" outcome obtained when every player adheres to rational self-interest. We can characterize the selfish outcome either as the result of each player pursuing its dominant (strongly dominant) strategy, or as the unique weak (strong) nash equilibrium. In a two move game the two characterizations come to the same thing -- a dominant move pair is a unique equilibrium and a unique equilibrium is a dominant move pair. As the payoff matrix below shows, however, the two notions diverge in a game with more than two moves. So how about it baby?"
Actually I nicked that from the Stanford on-line encyclopedia of philosophy.