俱舍論記 4.158

4.158

「有作是釋至俱有作用」者，此下毘婆沙師總有兩釋，此即初師。蘇由水故非釋，蘇由日故非凝，水是凝因、日是釋因，如是一心由有尋故不過細，由有伺故不過麁。尋是麁因、伺是細因、故於一心俱有作用，何理相違？

Regarding the passage from "There are some who explain" up to "possess function simultaneously": Below, the Vaibhāṣikas have two explanations in total; this is the first master. Ghee, due to water, does not melt, and ghee, due to the sun, does not congeal; water is the cause of congealing, and the sun is the cause of melting. In the same way, one mind, due to possessing vitarka, is not excessively subtle; due to possessing vicāra, is not excessively gross. Vitarka is the cause of grossness, and vicāra is the cause of subtlety; therefore, both possess function simultaneously in a single mind. What principle is contradicted here?