大般涅槃經義記 1.79

1.79

下觀無常，初先正觀，「誰有智」下寄聖顯過。前中汎論無常有三：一分段無常，六道果報，三世分異；二念無常，念念遷謝；三者自性不成實無常，有法虛集，都無自性。今略論二，「是身無常，念念不住」，是念無常，「如電光」等，喻以況之。「是身易」下，分段無常。「是身易壞如河岸」等，觀生易死，先法後喻。「不久」已下，觀死易至。上來正觀。「誰有智者當樂此身」，舉聖不樂，明身可厭。

Below, they contemplate impermanence: first directly contemplating; from "who that has wisdom" onward, relying on the sages reveals the fault. In the former, generally discussing impermanence, there are three kinds: 1. impermanence of delimited lifespans: the retributions of the six destinies, distinct throughout the three periods of time; 2. moment-to-moment impermanence: passing away moment by moment; 3. impermanence of self-nature not being established as real: existing dharmas are illusory aggregations, entirely lacking self-nature. Now two are briefly discussed: "this body is impermanent, not halting moment to moment" is moment-to-moment impermanence; "like a flash of lightning" and so forth uses analogies to illustrate it. From "this body is easily" onward is the impermanence of delimited lifespans. "This body is easily destroyed like a riverbank" and so forth contemplates that life easily dies, first the dharma and then the analogy. From "before long" onward contemplates that death easily arrives. The above directly contemplates. "Who that has wisdom would take delight in this body?" raises the sages' lack of delight to clarify that the body is loathsome.