釋禪波羅蜜次第法門 2.122

2.122

Furthermore, if while sitting one has the three states of wind, air, and so forth, this is called irregular, and employing the mind in that state will cause affliction, and the mind will also be difficult to concentrate. If one wishes to regulate it, one should rely on three methods: first, settle the mind downward; second, relax the body; third, visualize the breath pervading the pores, exiting and entering freely without obstruction. If one refines the mind and makes the breath ever so subtle, once the breath is regulated, multiple afflictions will not arise, and the mind will easily settle. This is called the practitioner's method of regulating the breath upon initial entry into concentration. To state the essential point: being neither sluggish nor rushed is the mark of a regulated breath.