成唯識論述記 6.231

6.231

述曰：論主通曰：此信體澄清，能淨心等，餘心、心所法但相應善。此等十一是自性善，彼相應故，體非善、非不善。由此信等俱故，心等方善，故此淨信能淨心等，依依士釋。又慚等十法體性雖善，體非淨相，此淨為相，故名為信。唯信是能淨，餘皆所淨故。以心王是主，但言心淨，不言淨心所，文言略也。

The Commentary states: The author of the treatise resolves it, saying: the substance of this faith is limpid and clear, and capable of purifying the mind and so forth; the remaining minds and mental factors are only wholesome through association. These eleven are wholesome by intrinsic nature; because the former are associated with them, their substance is neither wholesome nor unwholesome. Because of being concomitant with faith and the like, the mind and so forth only then become wholesome; hence this pure faith is capable of purifying the mind and so forth, based on a tatpuruṣa compound. Furthermore, although the substances and natures of the ten phenomena such as shame are wholesome, their substance does not have purification as its characteristic; this [faith] has purification as its characteristic, and is therefore called faith. Only faith is that which purifies, while the others are all that which is purified. Because the cittarāja is primary, it merely states "purification of the mind" without mentioning the purification of mental factors; the wording is abbreviated.