How to use the heart correctly during breathing must be understood. It is use without use. One need only let the Light fall quite gently on the hearing. This sentence contains a secret meaning. What does it mean to let the Light fall? It is the radiance of the Light of one's own eyes. The eye looks inward only and not outward. To sense brightness without looking outward means to look inward; it has nothing to do with an actual looking within. What does hearing mean? It is hearing the Light of one's own ear. The ear listens only within and does not listen to what is outside. To sense brightness without listening to what is outside, is to listen to what is within; it has nothing to do with actually listening to what is within. In this sort of hearing, one only hears that there is no sound; in this kind of seeing, one only sees that no shape is there. If the eye is not looking outward and the ear is not harkening outward, they close themselves and are inclined to sink inward. Only when one looks and barkens inward does the organ not go outward nor sink inward. In this way laziness and absent-mindedness are done away with. That is the union of the seed and the Light of the sun and moon.

When this self comes to weakness and to confusedness of mind, as it were, then the breaths gather around him. He takes to himself those particles of...

Here is required most inward sense or perception to understand this; for the place where the light is generated in the heart alone comprehendeth it,...