瑜伽論記 5.81

5.81

云何思釋？謂一行者，如對法云：以一法行歷諸法故，謂以一法與餘法一一互相問，除此法更以第二法與餘法互相問，如是一一一切當知。婆沙云：以一問一，以不相以問不相，以不世定名為一行。

How is it thought and explained? Regarding the "single traversal" (ekāṅga), as the Abhidharma states: Traversing all phenomena by means of a single phenomenon means that by using one phenomenon, one questions all other phenomena one by one; then, setting aside this phenomenon, one takes a second phenomenon and questions all other phenomena with it mutually; all should be understood in this way one by one. The Vibhāṣā states: Questioning one with one, questioning non-mutual with non-mutual, and taking what is not worldly fixed is called a single traversal.