Shine the light inward. Body and mind will drop away. A meditation instruction from Eihei Dogen, one of Buddhism’s greatest teachers.

The Way is originally perfect and all-pervading. How could it be contingent on practice and realization? The true vehicle is self-sufficient. What need is there for special effort? Indeed, the whole body is free from dust. Who could believe in a means to brush it clean? It is never apart from this very place; what is the use of traveling around to practice? And yet, if there is a hairsbreadth deviation, it is like the gap between heaven and earth. If the least like or dislike arises, the mind is lost in confusion. Suppose you are confident in your understanding and rich in enlightenment, gaining the wisdom that knows at a glance, attaining the Way and clarifying the mind, arousing an aspiration to reach for the heavens. You are playing in the entranceway, but you are still short of the vital path of emancipation. …

Therefore, put aside the intellectual practice of investigating words and chasing phrases, and learn to take the backward step that turns the light and shines it inward. Body and mind of themselves will drop away, and your original face will manifest. If you want to realize such, get to work on such right now. …

You must know that the true dharma appears of itself, so that from the start dullness and distraction are struck aside.

Once you have adjusted your posture, take a breath and exhale fully, rock your body right and left, and settle into steady, immovable sitting. Think of not thinking. Not thinking—what kind of thinking is that? Nonthinking. This is the essential art of zazen.

The zazen I speak of is not meditation practice. It is simply the dharma gate of joyful ease, the practice-realization of totally culminated enlightenment. It is the koan realized; traps and snares can never reach it. If you grasp the point, you are like a dragon gaining the water, like a tiger taking to the mountains. For you must know that the true dharma appears of itself, so that from the start dullness and distraction are struck aside. …

This being the case, intelligence or lack of it is not an issue; make no distinction between the dull and the sharp-witted. If you concentrate your effort single-mindedly, that in itself is wholeheartedly engaging the way. Practice-realization is naturally undefiled. Going forward is, after all, an everyday affair.

From Dogen’s Universally Recommended Instructions for Zazen. Translated by the Soto Zen Text Project.