" At the beginning of zazen meditation, when all is still, the sound of the valley stream is loud and clear. When we pace slowly after meditation, to ease leg pains and drowsiness, the sound of the stream seems to be less audible. When zazen is completed, the sound cannot be heard at all. Why should this be? "

― , Zen Seeds: 60 Essential Buddhist Teachings on Effort, Gratitude, and Happiness