釋禪波羅蜜次第法門 7.43

7.43

此阿那波那等十六行是慧性，無一息入出而不覺，故彼師自云：「依經明十六特勝。」今既未見經文，但述而不作，亦未敢治定。次師別解云：「若對四念處起十六行，無往不爾。」但分之不調，如無漏十六行，約四諦中，一諦下有四，四四十六，有漏亦復應爾。

"These sixteen practices, including ānāpāna, are of the nature of wisdom; there is not a single in- or out-breath that is not noticed." Thus that master himself says, "I rely on the sūtra to clarify the sixteen sublime practices." Now, since we have not yet seen that sūtra passage, we merely transmit it without constructing, nor do we venture to definitively establish it. Another master gives a different explanation, saying: "If one gives rise to the sixteen practices corresponding to the four applications of mindfulness, there is nowhere that it does not apply." It is just that the divisions are not harmonized. For instance, just as with the sixteen undefiled practices, in terms of the four truths there are four under each truth, four times four making sixteen; the defiled should likewise be so.