成唯識論演祕 2.531

2.531

釋曰：異相異法，若即是前住相住法異義不成，非別法故，此乃進責。若異相法異前住相所住之法，法即非一。若住異法而有別者，有違宗過，彼許一法有住異故，此退責也。

Explanation: If the characteristic of difference and the phenomenon of difference were identical with the preceding characteristic of duration and phenomenon of duration, the meaning of difference would not be established, because it is not a distinct phenomenon; this is the challenge on advancing. If the phenomenon of the characteristic of difference is different from the phenomenon possessed of the preceding characteristic of duration, then the phenomenon is not single. If the phenomena of duration and difference are distinct, there is the fault of contradicting one's own tenet, because they admit that a single phenomenon possesses duration and difference; this is the challenge on retreating.