金剛經纂要刊定記 7.178

7.178

初、如夢者。人之神遊也。以過去所作見聞事業皆是所念之處，與夜來夢無有差別，憶之可說掬之不見。如經云：「如寤時人說夢中事」，心縱精明，欲何因緣取夢中物？

First, "like a dream": it is the roaming of a person's consciousness. Because what was done, seen, and heard in the past are all objects of memory, they are not different from dreams of the past night. When recollecting them, one can speak of them, yet grasp them and they cannot be seen. As a sūtra says: "Like an awake person speaking of matters in a dream," even if the mind is extraordinarily clear, by what cause or condition could one take hold of an object in a dream?