俱舍論記 4.162

4.162

「若有別體類至別相云何」者，論主復難。於心所中，若有麁、細二別體類以別尋、伺，理實無違；然無麁、細二別體類，故成違理。上名為麁、下名為細，下准此釋。同一心體類中，無容麁、細俱時起故。又解：同一性體類心、心所中，無容細、麁俱時起故。汝毘婆沙師若言尋、伺體類亦有差別，應說體類別相云何。

"If they had distinct intrinsic substances and classes ... what are their distinct characteristics?": Here the author of the śāstra objects again. If among mental factors there were two distinct intrinsic substances and classes—coarse and fine—by which to differentiate vitarka and vicāra, in principle there would indeed be no contradiction. But since there are no two distinct intrinsic substances and classes of coarse and fine, it turns out to be contrary to reason. "Superior" is called coarse, and "inferior" is called fine; the subsequent text should be understood in accordance with this explanation. For within the same class of mental substance, there is no possibility that the coarse and the fine arise simultaneously. Another explanation: within mind and mental factors of the same nature, substance, and class, there is no possibility that fine and coarse arise simultaneously. If you, the Vaibhāṣikas, say that vitarka and vicāra also have a difference in substance and class, you should state what the distinct characteristics of their substances and classes are.