Is there any evidence Jobs actually wrote this or sent it to himself? This sounds like an inspirational fake-quote chain letter from the 1990s, the kind of thing that Snopes once specialized in debunking.
I really think this sounds like him. He was always a poetic and philosophical dude, very much a hippie in more ways than one. Another commenter mentioned it coming up in a recent book by Laurene Powell Jobs: https://news.ycombinator.com/item?id=37812974
