瑜伽師地論略纂 8.177

8.177

論曰「善知瑜伽，即善知方便」者，以知行與理相應，因智行能與果共相應，故知名方便，即亦號相應也。

The treatise says: "Skilled in knowing yoga means skilled in knowing upāya." Because one knows that practice corresponds with principle, and causal cognitive practice is able to correspond mutually with the fruit, it is therefore called knowing upāya, which is also titled corresponding.