瑜伽師地論略纂 6.8

6.8

In the fifth, the Sūtra on Distinguishing the Four Inspected Practices, the text has three parts: first, citing the sūtra to state [the topic]; second, briefly showing the marks of inspected practice; third, extensively showing the practices inspected. That is, the four portions of purified concentration are what is inspected, and what inspects is the three prajñās; this means that one single person fully cultivates all four kinds.