俱舍論疏 30.154

30.154

論「答此如前至漸變異故」，外救。我宗許非常漸有變異。如前難云：何修力最強者，寧不恒時生於自果？答云：由此心有住異相故。我答此難亦與彼同，由有行體有漸變異故。

On the Śāstra's statement: "The answer to this is as before [...] because it gradually undergoes alteration": The opponent defends: our school accepts that it is impermanent and gradually undergoes alteration. Just as the earlier objection asked: why does that which has the strongest cultivation power not perpetually produce its own effect? To which the answer was: because this thought has the characteristic of abiding-decay (alteration). My answer to this objection is also identical to that: because the substance of the disposition gradually undergoes alteration.