Breathing is central to every aspect of meditation training. It's a wonderful place to focus in training the mind to be calm and concentrated.
Jon Kabat-ZinnWhen 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-ZinnHow we see and hold the full range of our experiences in our minds and in our hearts makes an enormous difference in the quality of this journey we are on and what it means to us. It can influence where we go, what happens, what we learn, and how we feel along the way.
Jon Kabat-Zinn