Eric Barker also writes about how happiness leads to success, not the other way around.

http://pandawhale.com/post/1806/whats-the-most-important-thing-to-do-if-you-want-a-successful-life-barking-up-the-wrong-tree

Make no mistake, the path you’re on right now is not straight.

Even if it feels like it is. Things will go wrong. Plans will fall apart. The only thing in your control is how you’ll respond. Being content, grateful and (yes) satisfied in today’s culture seems nearly impossible. But those things are much more likely to get you to the right destination than chasing fame, ego, titles, money. What follows is a list of the most powerful lessons I’ve learned from my experience — all of which you can apply right now.