俱舍論記 4.4

4.4

「有定俱生至此中不說」者，就答中，一總答、二別明。此即總答，必有諸行決定俱生。總說諸法略有五品，所以不說無為，此品明諸法用，所以但明前四品法。就中，色、心，〈界品〉廣明，更不別顯，但辨但生。心所、不相應，前來不說，此品廣明，且辨俱生。

Regarding 'There are [phenomena that] definitely arise together [...] are not spoken of here': within the reply, [there are]: first, a general reply; second, a specific explanation. This is the general reply: there are necessarily conditioned formations (saṃskāra) that definitely arise together. Generally speaking, phenomena are briefly categorized into five classes. As for why the unconditioned (asaṃskṛta) is not mentioned: this chapter clarifies the functions of phenomena, and therefore it only explains the former four classes of phenomena. Among them, matter (rūpa) and mind (citta) have been extensively explained in the 'Dhātu-nirdeśa' and are not separately demonstrated again; only their co-arising is analyzed. Mental factors (caitasika) and non-associated [formations] (citta-viprayukta-saṃskāra) have not been discussed previously; this chapter explains them extensively and temporarily analyzes their co-arising.