瑜伽論記 13.199

13.199

言或頓不頓緣者，景云：總緣五塵名頓等。泰云：此即釋前，或於一時與三四，乃至七俱，謂若有五識，何故定有意識，解此問意，由意識亦得解他五識境故，五識起時定有意識，由此道理，故有三四乃至七俱。

Concerning the phrase 'either takes objects all at once or not all at once': Jing says: Taking the five sense-objects collectively is called 'all at once', and so forth. Tai says: This explains the preceding phrase, 'or at one time it is accompanied by three, four, up to seven [consciousnesses].' That is, if the five consciousnesses exist, why is there definitely a mental consciousness? To resolve this query: because the mental consciousness can also understand the objects of the other five consciousnesses, when the five consciousnesses arise, the mental consciousness definitely exists. According to this principle, there are three, four, up to seven co-arising.