俱舍論記 1.234

1.234

「心心所法生之本故」者，通。無為雖非同類因生心、心所，為境界生心、心所故，亦名生本。《正理》破云「若爾，處、界義應相濫，俱心、心所生本義故。」若作俱舍師救云：一同類因名生本，十七界全、一界少分。二境界緣生名生本，謂無為一界少分。從多分說，處義不同，少分相濫亦無有失。

"Because it is the root of the arising of mind and mental factors" resolves [the objection]. Although the unconditioned does not generate mind and mental factors as a homogeneous cause, because it generates mind and mental factors as an intentional object (viṣaya), it is also called a root of origination. The Nyāyānusāra refutes this, saying: "If so, the meanings of āyatana and dhātu would conflate, because both would mean being the root of the arising of mind and mental factors." If the master of the Kośa were to defend this, he would say: First, being the root of origination as a homogeneous cause applies to the whole of seventeen dhātus and a small part of one dhātu. Second, being the root of origination as an objective condition applies to a small part of one dhātu, namely the unconditioned. Because [the definition] is stated according to the predominant portion, the meaning of āyatana is distinct, and a slight conflation in a minor part incurs no error.