諸經要集 3.78

3.78

第八念安般者。謂專精念安般者。若息長時。觀知我今息長。若復息短。亦當觀知我今息短。若息極冷極熱。亦當觀知我今息冷熱。出入分別數息長短。除諸亂想自致涅槃。不離安般便獲功德。是名念安般。

Eighth, mindfulness of ānāpāna: this means one with concentrated diligence is mindful of ānāpāna. When the breath is long, one observes and knows: 'My breath is now long.' If the breath is short again, one should also observe and know: 'My breath is now short.' If the breath is extremely cold or extremely hot, one should also observe and know: 'My breath is now cold [or] hot.' Discerning the exhalations and inhalations, one counts the breaths as long or short. Eliminating all turbulent thoughts, one personally attains nirvāṇa. Not departing from ānāpāna, one then obtains merit. This is called mindfulness of ānāpāna.