成唯識論述記 8.69

8.69

述曰：非此牽引、生起二種，唯屬彼十因中牽引、生起二因全，所以者何？此二之中，有非因緣，攝盡便寬，能生是因緣故，餘引發等四因中，有因緣種故，若唯攝二，不攝便狹。

The Commentary states: It is not that these two kinds, traction and generative, belong solely to the entirety of the two causes of traction and generative among the ten causes. Why is this? Within these two there are non-direct causes, so if they subsumed them completely, it would be too broad, because the productive is a direct cause; and within the remaining four causes such as bringing-forth, there are seeds of direct cause, so if they subsumed only the two, without subsuming [the rest], it would be too narrow.