The greatest beauty is often overlooked. The details that make up the bigger blur are often lost on the casual observer, whether they are looking at the sky, a flower or another human being.
I was talking to a friend just yesterday about the place he works and he was telling me that all of those things that one does that are spectacularly executed, beautifully designed and perfectly received are forgotten, but the one thing that fails, the one project that blows up in your face leaves an indelible stain.
I've commented more than once on how it seems that the memories most accessible are those of negative, not positive events. They are no more powerful than the positives, but seem to be stored for ready access while the pleasant memories must be coaxed to the fore.
This is human nature and as humans, we should try to overcome it. It can be argued, and not without merit, that our instinctual need to hold on to those things that have hurt us in the past to protect us in the future is a basic part of who we are as human beings. I think it worth noting that we are advancing far faster than evolution can adjust. Therefore, it's up to our intellectual selves to retrain our instinctual selves.