成唯識論述記 7.63

7.63

The Commentary states: This means that each of these has two: first, defiled; second, undefiled. This means that each of these four dharmas is defiled or undefiled, while the two neutral ones are assigned accordingly. Why is this phrase stated? Because, unlike the wholesome and defiled states discussed earlier, which each belong exclusively to a single nature and do not extend across defiled and wholesome, [these do]. Another explanation is: this statement is solely to exclude [the assumption of exclusive] defilement, for Yogācārabhūmi fascicle 55 and elsewhere explain them as secondary afflictions; fearing they might be thought, like the previous ones, to be exclusively defiled, it therefore sets down the phrase extending to "two".