Don’t pay more than the “face value”. Sometimes when an unpleasant incident happens, we let it affect us emotionally and psychologically longer than the mere incident itself. To me (someone from the finance background), in such case, we are paying more than the face value (the price required – essentially overpaid).
For example, if I overslept and ended up running late for work. I got stressed out and it ruined my entire day feeling bad about it. The face value for oversleeping is being late for work. If it affects the rest of my day adversely, I am paying TOO MUCH for the mistake. I think this principle applies in other situations. Don’t let a negative incident/feeling linger on and cause a bigger damage.
Remind yourself that you have ALREADY paid for the mistake and MOVE ON.