When people say "Let it go," what they really mean is "Get over it," and that's not a helpful thing to say. It's not a matter of letting go - you would if you could. Instead of "Let it go," we should probably say "Let it be"; this recognizes that the mind won't let go and the problem may not go away, and it allows you to form a healthier relationship with what's bothering you.
Jon Kabat-ZinnI was very much a tough New York street kid. I went to a school where you had to learn how to get along with everybody or fight with everybody, and I did my fair share of both.
Jon Kabat-ZinnEven though in principle we may "know better", we routinely succumb all the same to the incessant, often frantic and unexamined busyness of thinking we have to get somewhere else first before we can rest; thinking we need to get certain things done to feel we have accomplished something before we can be happy.
Jon Kabat-Zinn