That's a decent piece of advice that I heard this morning. Combine Labor & Love.
That's pretty straight forward...easier said than done...
A couple of decent examples of combining the two:
1. My dad owned a record distribution company, taught martial arts to the Columbus Police, recorded a bunch of albums with his band, bought and sold a few dozen houses, wrote/performed/produced/directed a ton of commercials, and produced me. He used to say, "find a hobby that will make some money, not cost you money". I guess I've been hearing that same advice for most of my life and that's why it rang true when I heard Zach Galifianakis repeat it.
2. Mr. Bob Saget
One not so great example of combining Labor & Love