To let go means to give up coercing, resisting, or struggling, in exchange for something more powerful and wholesome which comes out of allowing things to be as they are without getting caught up in your attraction to or rejection of them, in the intrinsic stickiness of wanting, of liking and disliking.
Jon Kabat-ZinnMeditation means learning how to get out of this current, sit by its bank and listen to it, learn from it, and then use its energies to guide us.
Jon Kabat-ZinnMindfulness means moment-to-moment, non-judgmental awareness. It is cultivated by refining our capacity to pay attention, intentionally, in the present moment, and then sustaining that attention over time as best we can. In the process, we become more in touch with our life as it is unfolding.
Jon Kabat-Zinn