法界次第初門 1.293

1.293

十二、觀無常。修特勝者，離三禪、入四禪時，常修觀照，是故若發四禪不動定時，即自觀達定中心識虛誑，念念生滅，故云觀無常也。若對念處，從此有五特勝，皆屬法念處觀。

12. Contemplating impermanence. When one who cultivates the superior stages leaves the third dhyāna and enters the fourth dhyāna, one constantly cultivates contemplative illumination; therefore, when the immovable concentration of the fourth dhyāna arises, one naturally contemplates and comprehends that the mind and consciousness within concentration are illusory, arising and ceasing thought-moment by thought-moment; hence it is called 'contemplating impermanence.' Correlated with the bases of mindfulness, from here there are five superior stages, all belonging to the contemplation of mindfulness of phenomena.