A Buddhist monk once told me: "All I have learned in the twenty years that I have been a monk I can sum up in one sentence: All that arises passes away. This I know." What he meant, of course, was this: I have learned to offer no resistance to what is; I have learned to allow the present moment to be and to accept the impermanent nature of all things and conditions. Thus have I found peace.

Eckhart Tolle

from The Power of Now: A Guide to Spiritual Enlightenment