成唯識論述記 8.570

8.570

述曰：識是業者，彼說業種為識支故。彼論問言：「何故識支業染所攝？」答：「諸行習氣所顯故」，即行種子名識故也。

The Commentary states: Regarding consciousness being karma: that is because it designates karmic seeds as the link of consciousness. That treatise asks: ‘Why is the link of consciousness subsumed under the defilement of karma?’ It answers: ‘Because it is manifested by the habit-energies of all volitional formations.’ That is, the seeds of volitional formations are called consciousness.