Once you let yourself believe that you've gotten to the top, you've lost sight of the real goal. Which is to keep climbing no matter what. And by climbing, I don't mean trying to out do yourself with even more accomplishments. Instead, what I mean is that just when we think we have done something well, we should start looking at the other areas of our lives that need attention.
I like to believe that you don't need to reach a certain goal to be happy. I prefer to think that happiness is always there, and that when things don't go the way we might like them to, it's a sign from above that something even better is right around the corner.