成唯識論了義燈 5.24

5.24

言互相增益者，問：第七與六為雜染依，增益於六，六識如何增益第七？答：有二義：一、者增長；二、者不損。若第六識發業感八為彼依緣，得相續住，故名增益。起有漏時，設雖不能增長第七，而不損害，亦名增益。非如無漏，起必損彼，不名增長。亦如眠睡，雖於眼根不能增長，而不損害，亦名長養。此亦應爾。

Regarding 'mutually augmenting': Question: The seventh serves as the basis of defilement for the sixth, augmenting the sixth; how does the sixth consciousness augment the seventh? Answer: There are two meanings: first, increasing; second, not harming. If the sixth consciousness initiates karma that karmically draws the eighth, which serves as the support and object of that [seventh], enabling it to abide in succession, it is called 'augmenting'. When giving rise to sāsrava [states], even though it might not increase the seventh, it does not harm it, and this is also called 'augmenting'. It is not like anāsrava, the arising of which must harm it, which is not called 'increasing'. Just as sleep, although incapable of increasing the eye faculty, does not harm it and is also called 'nourishing'. This should also be understood in the same way.