Living to please yourself and yourself alone will always leave you miserable

You kind of realize after a certain point that no next vacation, no promotion, no house, no car, no accomplishment, no anything you want is ever going to make you happy. You figure it out when you get the thing you thought would fill the void, and then there you are again. You feel just like you did before.

The desires of the heart are misleading in that you think they give you purpose, but the purpose cannot just be found in one's self. It appears there is a larger system at play, and purpose is defined through your contribution to it.