Sometimes emotions can be destructive to oneself or to one's environment; nature is the cure. Go to a place with a big waterfall and sit near the bottom, but not where you will get wet. By looking at the waterfall coming down from the sky, you will be washed and cleansed by it. Your emotions and your psychological experiences will all be washed away. The water comes from the highness of the mountain; it rushes down to hit the pond or stones beneath it, pounding through the obstacles of your life. Through perseverance, a stone gives way and is shaped by water. Also, by the action of water, a pond is formed. Use the waterfall to cleanse away your worries, the contamination from your experiences in the world, and your disappointed thoughts about something that has failed or something that cannot come back.

Hua-Ching Ni in Entering the Tao