When I was a sixteen-year-old novice monk, my teacher taught me to open the door and close the door with one hundred percent of myself. One day, my teacher asked me to get something for him. Because I loved him very much, I was eager to do so, so I rushed to do this task and closed the door quickly.
My teacher called me back: "Novice, come back here." I went back to him. I joined my palms and looked at him. He said, "Novice, this time go out mindfully and close the door behind you mindfully." That was the first lesson he gave me on the practice of mindfulness.
— Thich Nhat Hanh, The Art of Power