摩訶止觀 3.37

3.37

Answer: By analogy. How so? There are three kinds of karma: defiled karma, undefiled karma, and neither-defiled-nor-undefiled karma. These induce three retributions: fragmented [samsāra], expedient, and real retribution. Retribution stems from three kinds of afflictions: seizing on marks, dust-and-sand, and avidyā. Moreover, in terms of the three retributions, each opens into the three paths. In terms of the three afflictions, each opens into the four inversions.