Well, I suppose you could start by not repeating it. Then, after in fact not having repeated it for a while, you might be in a position to assert that you weren't going to repeat it either.

I've heard a little about 12-step programs from friends, though I've never been in one myself. I understand that one of the steps involves making amends to anyone you've harmed. By any chance does that sound like a possible way of getting over your past?

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Dear Sir: My conscience has been bothering me so here's $100 that I stole from you. If my conscience still bothers me I'll send the rest.