摩訶止觀 9.42

9.42

又見身中三十六物，如開倉見穀、粟、麻、豆。若對根本，即初禪位。前八觸觸身倉，心眼不開，不見內物。特勝既有觀慧，觸開身倉，心眼即見三十六物：肝如菉豆；心如赤豆；腎如烏豆；脾如粟；大小腸道更相應通，血脈灌注如江河流。內有十二物：肝、心、痰、癊等。中有十二：膜、膚、肪、膏等。外有十二：髮、毛等。出入息統致其間，不淨、無常、苦、空、無我，一切身行皆休，終不為身而造諸惡。是名「除諸身行」。若對道品，是身念處；若對根本，即是覺、觀兩支。心眼初開，是覺支；分別三十六物無謬，是觀支。

Furthermore, one sees the thirty-six substances within the body, like opening a granary and seeing grain, millet, hemp, and beans. If matched against the fundamental, this corresponds to the rank of the first dhyāna. Previously, when the eight sensations touched the bodily granary, the mind's eye was not open, and one did not see the internal substances. Because the extraordinary possesses the wisdom of contemplation, upon contact opening the bodily granary, the mind's eye immediately sees the thirty-six substances: the liver is like mung beans; the heart is like red beans; the kidneys are like black beans; the spleen is like millet; the large and small intestines communicate and connect with each other, and the blood vessels flow and pour like rivers and streams. Inside there are twelve substances: liver, heart, phlegm, fluids, etc. In the middle there are twelve: membranes, skin, fat, lard, etc. On the outside there are twelve: hair, body hair, etc. The in-breaths and out-breaths govern and flow among them. Impure, impermanent, painful, empty, and non-self—all bodily formations cease entirely, and one never again creates evils for the sake of the body. This is called "calming all bodily formations." Matched against the factors of the path, this is the smṛtyupasthāna of the body; matched against the fundamental, it corresponds to the two factors of initial thought and sustained thought. When the mind's eye first opens, that is the factor of initial thought; distinguishing the thirty-six substances without error is the factor of sustained thought.