大乘義章 16.30

16.30

次第三門就常無常以論不同。小乘所修，始終無常，生滅心識以為體故。大乘不爾，始修無常，終成是常，成處真心以為體故（此三門竟）。

Next, the third heading discusses the difference in terms of permanence and impermanence. What is cultivated in the Hīnayāna is impermanent from beginning to end, because it takes the arising and ceasing mind-consciousness as its essence. The Mahāyāna is not like this: its initial cultivation is impermanent, but its final realization is permanent, because it takes the true mind in the state of realization as its essence (this completes the third heading).