A few years ago, when I 'met' Robert Greene, I thought about self-improvement a lot.
The biggest fear I had about setting my life goal was, what if I reach the life goal too soon. What then?
So I decided I have find a goal that will make me motivated, fulfilled, at the same time not be able to complete it and still be happy about it.
I realized my life goal is to be better every day (and grow exponentially). ;)