大乘起信論裂網疏 6.121

6.121

善修觀者，即觀是止，念念與菩提心相應，便契第一義諦不思議境，此觀便是無分別智。今為不得意人，散心緣四諦境，雖發弘願，不知四諦秖是一心，多生疑惑，故於本來無二法中，巧示雙行方便。

For one who excels at cultivating special insight, special insight itself is calm abiding; thought after thought corresponds with the bodhicitta, and one directly tallies with the inconceivable realm of the ultimate truth—this special insight is itself non-conceptual wisdom. Now, for those who do not grasp the import, whose scattered minds focus on the realm of the four truths and, although giving rise to the great vows, do not know that the four truths are merely the one mind, giving rise to many doubts, [the treatise] skillfully demonstrates the expedient of dual practice within what is fundamentally non-dual Dharma.