Indeed we have learned.

As I stared down at the circular scar left on the inside of my foot, I felt a sharp rush of pain. Not from the scar, but from the mistake attached to it. Where did I go wrong with you? And why is there a scar to remind me? It's funny to think how parallel a scar and a mistake are. Both caused by pain, both leaving a mark. However the beauty of scars is the simple fact that they show healing. Even though a wound never completely goes away, it repairs itself to the best of it's ability, and the wound is covered by something new. Much like our mistakes, although the memory of our mistake will stay with us, the pain will eventually become new, and all that is left is a mark showing that we indeed have learned, and that is really all we can ever do.