大乘起信論義記 2.285

2.285

In the analogy, the statement "no substance can be found" demonstrates that these sensory realms, apart from the mind, have no substance that can be found. Furthermore, because they are precisely the mind, they are again devoid of substance, just as outside a mirror there is no reflection, and inside a mirror there is likewise no substance. In resolving the doubt, the doubt says: "Since they have no substance, why do they appear vividly?" The explanation says: "These are all false manifestations upon the true mind; where could there be any substance that can be found?" In the inverse verification, the doubt says: "How is it known that they manifest upon the mind?" The explanation says: "It is known because 'when the mind arises, various phenomena arise', and so forth." Here, because by the power of avidyā the non-enlightened mind moves, and so forth, up to being able to manifest all sensory realms, it is said that "when the mind arises, various phenomena arise." This means that the mind moves in accordance with perfuming, and therefore it is said to 'arise'. If avidyā ceases, the sensory realms cease accordingly, and the discriminations of all consciousnesses cease without remainder; therefore it is said that "when the mind ceases, various phenomena cease." This means that the source of the mind returns to purity, and therefore it is said to 'cease'. Since the mind, following non-enlightenment, falsely manifests all sensory realms, this verifies that all sensory realms are only mind and devoid of substance.