Work on Stuff that Matters

It’s easy to get caught up in the heady buzz of making money. You should regard money as fuel for what you really want to do, not as a goal in and of itself. Money is like gas in the car—you need to pay attention or you’ll end up on the side of the road—but a well-lived life is not a tour of gas stations!

Whatever you do, think about what you really value.
Tim O’Reilly, Work on Stuff that Matters: First Principles