成唯識論掌中樞要 2.36

2.36

To grant that a generic category is nominal and cannot sustain the real seeds of internal dharmas: in the first fascicle above, like a dike or embankment, nominal [structures] ward off real water; why would this not be so here? Temporarily halting and warding off can certainly be nominal; enduringly sustaining forever is unreasonable. If so, the Buddha's body, the prātimokṣa vows, and so forth also ward off permanently; why would their meanings differ? Warding off has the sense of cessation, so the nominal can ward off the real; sustaining has the sense of upholding, hence the nominal does not sustain.