俱舍論疏 5.117

5.117

論「理不應然至恒異熟故」，有部出過。若一切識唯是異熟，可說唯業能持。有情或起善、染之心，及異地無漏諸識互起，如何得說唯業持識？

Regarding the treatise's statement, "This is not logically sound ... because it is invariably a vipāka": The Sarvāstivāda school exposes the error. If all consciousness were exclusively vipāka, one could say that karma alone could sustain it. However, sentient beings may give rise to wholesome or defiled minds, and consciousnesses of disparate stages and of the anāsrava level arise reciprocally; how could it be said that karma alone sustains consciousness?