"I'm making a list of 100 things to do before I die and am up to 73...My number one outwardly verbalized goal (not counting the one I have decided not to talk about) is to keep the list up-to-date at all times. In many ways, I think this is a great way to answer the unanswerable fundamental purpose question that alluded me for so long."
Interesting idea. Potentially very powerful.