I came across a Google+ comment from the Dali Lama (!) and since that service is a sluggish monstrosity, I decided I'm going to respond here.
"The very purpose of our life is happiness, which is sustained by hope."
With all due respect to my more famous colleague, I have to dispute him on this point. He goes on to do a relatively good job of describing what' hope' is, but it isn't his tautologies, but his teleology, that I disagree with.