Martin Luther King once said:

If you can't fly, then run! If you can't run, then walk. If you can't walk, then crawl, but whatever you do you have to keep moving forward

One of the secrets of life, is to keep moving forward and don't lose much time with things you can no longer change. Times passes so fast, that every minute is precious and the older you get the more you realize it.
Thanks for the inspiration @goodvibrations