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-ZinnConcentration is a cornerstone of mindfulness practice. Your mindfulness will only be as robust as the capacity of your mind to be calm and stable. Without calmness, the mirror of mindfulness will have an agitated and choppy surface and will not be able to reflect things with any accuracy.
Jon Kabat-ZinnIn any given moment we are either practicing mindfulness, or defacto, we are practicing mindlessness.
Jon Kabat-ZinnNo one can listen to your body for you... To grow and heal, you have to take responsibility for listening to it yourself.
Jon Kabat-Zinn