法界次第初門 2.238

2.238

Second, volitional formations: 'One further contemplates the conditions of the three feelings, the five skandhas, the twelve āyatanas, and the eighteen dhātus. What is this contemplation? Following the mind in mindfulness, one contemplates the entering and exiting of breath, and contemplates the skin, flesh, sinews, bones, marrow, and brain of the internal body as being like clouds in the sky; the wind in this body is also like this. There is wind that can ascend, wind that can descend, wind that can fill, wind that can dry, and wind that can increase. Therefore, the entering and exiting of breath is called bodily formations. Because breath arises from vitarka and vicāra, it is called mental formations. Harmonizing to produce sound is called verbal formations.'