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-ZinnMost people don't realize that the mind constantly chatters. And yet, that chatter winds up being the force that drives us much of the day in terms of what we do, what we react to, and how we feel.
Jon Kabat-ZinnI thought it was a stroke of genius that Hans Selye used the word stress, because it's true that if you don't know how to be in wise relationship to life, certain health consequences are bound to happen. If you stand up 12 hours a day on an assembly line, or constantly tell yourself life is not worth living, the body will respond in certain somewhat predictable ways.
Jon Kabat-Zinn