What keeps you writing when you don’t want to write? What keeps you writing when you feel you don’t have the time? What keeps you writing when you’re cranky, depressed, angry, tired?
Fill at least two sides of a standard sheet of paper free-writing on this topic. Let it flow, not worrying for now about whether your answers seem to make any sense. Every now and then come back to this one; you’ll more than likely find your answers are different every time.