成唯識論掌中樞要 2.44

2.44

Regarding 'at the time of taking birth and dying, the ākāras and ālambanas of the six pravṛtti-vijñānas must be knowable': the Sarvāstivādins and others assert that mental consciousness has knowable ākāras. Therefore, we now object to them, saying: if they were knowable, they should be clearly knowable just as in other states. Since there is no discrimination, it is clear that it is not mental consciousness.