摩訶止觀 4.40

4.40

又「律」者，詮量輕重，分別犯非犯。觀心亦爾，分別見思麁惡滓重。界內無知，小、輕；塵沙客塵橫起，復為小重；根本微細，如上菩提心中已說。三觀觀三理，是不犯；三惑障三理，名為犯。三藥治三病，詮量無謬，纖毫不差。

Furthermore, "rule" (vinaya) means weighing the light and heavy, and discriminating offenses and non-offenses. Contemplating the mind is also like this, discriminating [delusions of] view and thought as coarse, evil, turbid, and heavy. Ignorance within the realm [of saṃsāra] is minor and light; adventitious dust of dust-and-sand arising transversally is again slightly heavy; the fundamental [ignorance] is subtle, as already explained above under the mind of bodhi. The three contemplations contemplating the three principles is non-offense; the three delusions obstructing the three principles is named an offense. The three medicines curing the three diseases: the appraisal is without error, not differing by a hairsbreadth.