唯識二十論述記 2.179

2.179

述曰：先釋初句。今解初中「如夢等」字，能成喻法。等者，等取眩翳目等。緣見髮、蠅等，此等諸位，經部及大乘彼此共許外境非有，故以為喻。「如夢等」中，雖無離心外實境界，而彼言謂：我見是事，聞是事等，起此現覺。

The commentary says: First, the first line is explained. Now explaining the words 'like a dream and the like' in the beginning: this can establish the term of the analogy. 'And the like' includes cataracts, afflicted eyes, and so forth, which perceive hairs, flies, and so forth. In all these states, both the Sautrāntika and the Mahāyāna mutually agree that external objects do not exist, hence they are used as an analogy. In 'like a dream and the like,' although there are no real external objects separate from the mind, yet they say and think: 'I see this thing, hear this thing,' and so forth, giving rise to this direct awareness.