俱舍論頌疏論本 6.40

6.40

The explanation says: Only the unwholesome and the wholesome with out-flows are maturation causes, because they are phenomena of maturation. Question: "For what reason does the indeterminate (avyākṛta) not incur maturation?" Answer: "Because its power is weak, like a rotten seed." Question: "For what reason does the undefiled not incur maturation?" Answer: "Because it lacks the moistening of craving, like a sound and solid seed without the moistening irrigation of water. Furthermore, it is not bound to a stage; how could it incur a maturation bound to a stage? Other phenomena possess both [characteristics], and therefore are able to incur it, like a sound and solid seed irrigated by water." Regarding "maturation" (vipāka): according to the Sarvāstivāda school, the cause is wholesome or unwholesome, and the fruit is indeterminate; ripening in a different nature (visabhāgaṃ pacyate) is termed maturation. The four causes such as the co-existent [cause] ripen only as similar kinds, meaning that cause and fruit share the same moral nature. The one efficient cause (kāraṇahetu) combines both similarity and difference in ripening, meaning it has fruits of the same nature and fruits of a different nature. Therefore, the maturation cause here ripens exclusively in a different nature; hence this one alone is named the maturation cause.