俱舍論記 13.106

13.106

「若爾經說至定為應理」者，論主引經破異師說。諸有苾芻受他施已入四無量心定，身證此定具足圓滿。由此因緣，應知施主無量福增。施主爾時福恒增長，豈定常有緣彼施思方始增長？是故前師所言思所熏習微細相續漸漸轉變差別而生，定為應理。但由施已思所熏種福常增長，非由施主數緣境思方始增長。

"If so, what the sūtra states ... is definitely reasonable" is the author's citation of a sūtra to refute the other master's explanation. Whenever bhikṣus, having received another's gift, enter the absorption of the four immeasurables and personally realize this absorption fully and completely, by this cause and condition, one should know that the donor's merit increases boundlessly. At that time, the donor's merit increases constantly; must there always be a volition directed toward that gift before it can increase? Therefore, what the previous master stated—that the subtle continuum perfumed by volition gradually undergoes transformation and arises with distinctions—is definitely reasonable. It is solely due to the seed perfumed by volition after giving that merit constantly increases, not because the donor frequently directs volition toward the object before it can increase.