成唯識論述記 2.917

2.917

述曰：又若不許此有信等者，應非善心；無信等故；如染色等。此不善心等尚不名善，況是無漏？此即成立不善、無記心性非善，彼若救言：有漏善心，信等俱故，可生無漏；不善、無記，無信等故，非性淨者。

The Commentary states: Furthermore, if one does not accept that these possess faith and the like, they should not be good minds, because they are devoid of faith and the like, just like defiled form and so forth. These non-good minds and the like are not even called good, much less anāsrava. This establishes that the nature of non-good and indeterminate mind is not good. If they defend by saying: 'The sāsrava good mind, being accompanied by faith and the like, can produce the anāsrava; non-good and indeterminate [minds], lacking faith and the like, are not pure by nature'—[then the treatise objects]: