摩訶止觀 4.29

4.29

理觀觀心論持戒者，具能持得上十戒也。先束十戒為四意：前四戒，但是因緣所生法，通為觀境；次二戒，即是觀因緣生法即空，空觀持戒也；次兩戒，觀因緣即是假，假觀持戒也；次兩戒，觀因緣生法即是中，中觀持戒也。

Regarding the discussion of upholding the precepts through the contemplation of principle and contemplation of the mind, one can fully uphold the above ten precepts. First, we group the ten precepts into four meanings: the first four precepts are merely phenomena produced by causes and conditions, serving comprehensively as the objects of contemplation; the next two precepts consist in contemplating that phenomena produced by causes and conditions are identical with emptiness—upholding the precepts through the contemplation of emptiness; the next two precepts consist in contemplating that causes and conditions are identical with the provisional—upholding the precepts through the contemplation of the provisional; the final two precepts consist in contemplating that phenomena produced by causes and conditions are identical with the middle—upholding the precepts through the contemplation of the middle.