成唯識論述記 7.389

7.389

述曰：此返難彼，顯多識俱轉相，是五十一等八證中最初生起證。量云：諸緣具眼識起時，餘諸緣具耳等識亦應現起，諸緣具故，如現起眼識。此顯六識多境現前寧不頓取？諸根、境等等取空、明等，此和合力齊大勢，六識緣合相似，汝但言識前後生，不應理故。

The Commentary states: This turns the objection back against them, revealing the characteristics of multiple consciousnesses operating simultaneously; it is the first proof, the proof of arising, among the eight proofs in fascicle fifty-one and elsewhere. The syllogism is: when all conditions are complete and the eye-consciousness arises, the other ear and other consciousnesses whose conditions are complete should also presently arise, because their conditions are complete, just like the currently arising eye-consciousness. This shows: when the multiple objects of the six consciousnesses are present before one, why would they not be apprehended all at once? The 'faculties, objects, and so forth' includes space, light, and so on. As the force of this harmony is equal in great strength, and the conditions for the six consciousnesses to come together are similar, for you to say merely that consciousnesses arise sequentially is unreasonable.