The Jewish theologian Abraham Heschel described the Sabbath as a “sanctuary in time.” Walking is a sanctuary in motion. The peace we experience with each step adheres, and it conveys. Portable serenity. The pain evaporates. With each step, I feel less burdened, more buoyant, as if someone had inflated my shoes. I sense the seriousness of the earth, and its lightness, too. Step. Step.