My guru as far as this lesson goes is Zachtronics. He's a game dev who makes programming games and who created infiniminer, which Notch adapted into minecraft.
Zachtronics' games are some of the most fun I've played, and from a brief encounter (not irl) with the guy he seemed unperturbed (or like he'd made peace if he ever was) by the outcome.
There is a lesson here. In comparison, Notch appears very dissatisfied despite his accumulation of wealth.
That's sound advice, but as you said it's easier said than done. Every time I read about BTC, I get sick to my stomach thinking of what could have been. It's very tempting to view money as a possible solution to all of life's problems, particularly for those of us who don't have very fulfilling lives to begin with.
It's not a direct quote, but the gist is worth taking to heart. It's easy to say, not so easy to do. But you gain nothing by tossing and turning.