起信論疏筆削記 14.34

14.34

染淨盡不盡者，上說染淨各有功能，互相熏習，成於世間出世間，未知究竟何勝何劣？何法有盡何法不盡？若俱不盡，則徒為進修。若復俱盡，則成斷滅。若言一盡，盡於何法？故此明也。

Regarding whether the defiled and pure are exhaustible or inexhaustible: It was explained above that defilement and purity each possess functions, mutually perfuming one another to bring about the mundane and supramundane; yet it is not known which is ultimately superior and which inferior, or which dharma has an end and which dharma has no end. If both were inexhaustible, advancing in cultivation would be in vain. If both were exhaustible, it would result in annihilation. If it is said that one is exhausted, which dharma is exhausted? Hence this is clarified here.