金光明經文句記 3.38

3.38

二、「一切」下，從通對釋。想行念處者，秖是法念合此二陰；今欲配地，故存陰名。想取行行者，想取相貌、行乃遷流，故云行行。下行字，平聲。

Second, from 'All' downward, matching and explaining according to the general. The 'station of mindfulness of samjñā and saṃskāra' is simply the mindfulness of dharmas combining these two skandhas; now, desiring to correlate them with the earth, the names of the skandhas are retained. 'Samjñā grasping and saṃskāra acting': samjñā grasps characteristics, and saṃskāra is flux and movement, hence it is said 'acting of saṃskāra' (xíngxíng). The lower character *xíng* is in the level tone.