From others in general - Always invest in the things that separate you from the ground; shoes, tires, and your mattress.

From a coach I knew - Every so often sit down and make sure your actions fit with your goals. It’s easier to get off course than you think.

From my father - The Hassle Factor. A job can give you three things, enough money to make up for the time you don’t have, enough time to make up for the money you don’t have, and a sense of satisfaction. If you aren’t getting at least two of the three, the job isn’t worth the hassle.