[138] "And what, Rāhula, is the air element (vāyodhātu)? The air element may be internal or it may be external. And what, Rāhula, is the internal air element? Whatever internally, belonging to oneself, is air, airy, and appropriated — that is: winds going upward, winds going downward, winds in the belly, winds in the bowels, winds coursing through the limbs, in-breath and out-breath — or whatever else internally, belonging to oneself, is air, airy, and appropriated: this, Rāhula, is called the internal air element. Now both the internal air element and the external air element are simply the air element. That should be seen as it really is (yathābhūta) with right wisdom thus: 'This is not mine, I am not this, this is not my self.' Having seen it thus as it really is with right wisdom, one becomes disenchanted with the air element and makes the mind (citta) dispassionate toward the air element."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.