I had the opportunity to walk away with over $200 worth of lumber yesterday. I walked back inside, found somebody, and paid for it.
I thought about stealing, which contradicts who I think I am. However, it became more painful to do the right thing once I was open to a cheaper option: I opened my mind to justifications and rationalizations.
I talked myself into paying by considering that 1) I am not a person who causes problems for myself tomorrow by taking a shortcut today, and 2) If I want to be a good person, it has to be done every day in the most minor ways.