Zen has been called the “religion before religion,” which is to say that anyone can practice, including those committed to another faith. And that phrase evokes that natural religion of our early childhood, when heaven and a splendorous earth were one. But soon the child’s clear eye is clouded over by ideas and opinions, preconceptions and abstractions. Not until years later does an instinct come that a vital sense of mystery has been withdrawn. The sun glints through the pines, and the heart is pierced in a moment of beauty and strange pain, like a memory of paradise. After that day, at the bottom of each breath, there is a hollow place that is filled with longing. We become seekers without knowing what we seek.