Annette makes an interesting point about the costliest errors item.

We spend time learning how not to make the same mistakes again but it's doubtful if we spend enough time learning about the range of feeling and emotion evoked when we don't 'get it right'.

The mantra about embracing mistakes is fairly well-established and in some circles pretty much a cliche. I think Annette's pointing to the deeper emotional complexity: what one person sees as trivial another takes on the chin; "learning and moving on" is good idea but it's not the same journey for everyone.