I'd have to say it varies. My higher power was a biggie but mostly in the early days of my sobriety. Other than that, it's been a combination of not wanting to mess up a special relationship with another person i've found in sobriety, not wanting to cause emotional hurt to another person, and a lot of just plain stubbornness and pride that's keeping me sober today. Maybe not the ideal recipe, but that's my honest answer.
- Jim