The first day of the Purpose Driven Life reminds us that looking within ourselves for our purpose isn't going to give us the answer, because God has chosen our purpose.
When I look at one friend of mine, I can see that so much more clearly than I can see it for myself. I see a friend who is called to be an inspiration to others, who is called to be an example of survival, and who does not want that purpose and would never have chosen it. Who chooses to suffer, in order to become a hero to others? It's not something that anyone would ever want.
There is a purpose for my life, too, and it isn't necessarily one that I see, or would have chosen. I need to learn to accept that whatever it is, it is, whether I choose it or not.