成唯識論述記 7.226

7.226

述曰：但由五識內託本識，即種子也，外藉眾緣方得現前。以雖種子恒外緣合有頓、漸，起五或四、三、二、一識生故，或五至一，生不定故，或俱、不俱。七十六、《解深密》說：「廣惠！阿陀那為依止、為建立故，若於爾時有一眼識生緣現前，即於此時一眼識轉；乃至五緣頓現在前，即於爾時五識身轉」等。故五識由緣具、不具故生有多少，或俱、不俱。

[The Commentary states:] It is simply that the five consciousnesses internally rely on the root consciousness—namely, seeds—and externally depend on multiple conditions to be able to manifest. Because although seeds are constant, the meeting of external conditions has sudden and gradual aspects, five, four, three, two, or one consciousness may arise; because arising from five down to one is indeterminate, they are either together or not together. Fascicle Seventy-six of the *Saṃdhinirmocana-sūtra* states: 'Viśālamati! With the ādāna as support and foundation, if at that time the conditions for the arising of one eye consciousness are present, then at that time one eye consciousness turns; ... up to if five conditions are suddenly present, then at that time the five consciousness bodies turn', and so forth. Therefore, depending on whether the conditions are complete or incomplete, the five consciousnesses arise in greater or lesser number, either together or not together.