大乘義章 15.37

15.37

次就頓漸分別諸住。如《地持》說，前菩薩住漸次清淨，後如來住頓得清淨，教行頓成名為頓得，證行頓顯名為清淨。何故而然？彼菩薩地一一位中，所治障品品別無數，多時漸斷方乃窮盡，為是漸淨。障佛之障局唯一品，金剛心中一無礙道斷之畢竟，種智起時一切頓淨更無多品，故不漸淨。是為菩薩如來地別（此二門竟）。

Next, distinguishing the abodes according to the sudden and the gradual: As taught in the Bodhisattvabhūmi, the preceding bodhisattva abodes are gradually purified, whereas the subsequent Tathāgata abode is suddenly purified. The sudden completion of practice according to teaching is called sudden attainment; the sudden manifestation of practice according to realization is called purification. Why is this so? In each and every stage of those bodhisattvas, the categories of obstacles to be cured are countless and differentiated; only after being gradually severed over a long time are they finally exhausted; for this reason, they are gradually purified. The obstacle that obstructs the Buddha is confined to only a single category; in the vajropama-citta, a single unimpeded path severs it completely, and when all-knowledge arises, all is suddenly purified without further multiple categories; therefore, it is not gradually purified. This is the difference between the bodhisattva and Tathāgata stages. (This concludes the second portal.)