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-ZinnPeace is something that we can bring about if we can actually learn to wake up a bit more as individuals and a lot more as a species; if we can learn to be fully what we actually already are; to reside in the inherent potential of what is possible for us, being human.
Jon Kabat-ZinnMindfulness is so powerful that the fact that it comes out of Buddhism is irrelevant.
Jon Kabat-Zinn