We are now beating ourselves up. "How could I be so careless? What was I thinking?"
Rarely do we see this as the opportunity that it is- to learn something. If we made this mistake, there is a good chance that we have made it before. It might even be a behavioral pattern that we keep doing over and over again. If we learn this lesson now, we never have to experience this pain again. We could actually welcome the opportunity to learn from this experience. I call this, "blessing the lesson."
If we had learned the lesson before, we would not have needed to experience it again. Unfortunately, it often takes some pain or damage to get our attention. And... how long do we have to punish ourselves before we are willing to let it go? Just make sure we learn something before we do- no need to do this one again. Why not have some compassion for ourselves? What brought us to making such a mistake? Anyway, what are our choices? We can continue to beat ourselves up or we can try to glean value from it.
"Blessing the lesson" is promising yourself to never make that same mistake again. That ought to be a good enough reason to forgive yourself. Don't cha think?