Great rap! Love the Richard Feynman sampling. Like Greydon Square, I now make my own purpose ... but I didn't used to. As a Christian, I once believed that God had a plan, and that our purpose was to glorify him. But when I began to doubt I thought, what a crappy planner God was, and wondered, what kind of supreme being would demand the worship and adoration of his tiny little subjects? I find Dan Barker's response to the question spot on:

“Asking, "If there is no God, what is the purpose of life?" is like asking, "If there is no master, whose slave will I be?" If your purpose of life is to submit as a slave, then your meaning comes from flattering the ego of a person whom you should detest.”