The Elixir of Movement and Breath

As you go on breathing in this frame of mind, with these associations, alternating between movement and stillness, it is important that the focus of your mind does not shift. Let the true breath come and go, a subtle continuum on the brink of existence. Tune the breathing until you get breath without breathing; become one with it, and then the spirit can be solidified and the elixir can be made.

—  Chang San-Feng