瑜伽師地論略纂 6.8

6.8

第五、分別四撿行經中，文有三：一、引經標；二、略顯撿行相；三、廣顯示所撿行。即四分淨定為所撿，能撿察即三慧，此即一人具修四種。

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.