"There comes a time in every mans life when he looks in a mirror and realizes that is all he will ever be. Then he must learn to accept that, or kill himself. Or stop looking in mirrors"
Mind you, theres been books songs and many that have used the phrase since, and maybe one before the movie, but I heard it as a kid in 1985 and at first I thought it was just fun to say, then one day it smacked me in the face how simple, and poignant it really was, not just in the movie itself but in life.
"I see now that the circumstances of one's birth are irrelevant. It is what you do with the gift of life that determines who you are."
I love this quote. This is what Mewtwo said at the end of Pokémon: The First Movie.