成唯識論述記 3.178

3.178

述曰：引《厚嚴經》上之二句明內心有，外境是無；下之二句明自內心見、相二分有，謂即似能、所緣相是。「各自然而轉」者，謂見、相分各各自然，從其因緣和合而起，不必須待心外之境，或計大自在天之所作，故方乃得轉。今異於彼，說自然言，故緣龜毛，心影像起，此證有二分也。

The Commentary states: Citing the Ghanavyūha-sūtra, the first two lines clarify that the internal mind exists and external objects are non-existent; the latter two lines clarify that the two parts, darśana and nimitta, exist within one's own internal mind, referring to their resembling the marks of the cognizer and the cognized. "Each naturally rolls on" means that the darśanabhāga and nimittabhāga each naturally arise from the coming together of their causes and conditions, without necessarily depending on an object outside the mind, or [depending on] what is posited as created by Maheśvara, only then being able to turn. Now, differing from those, the word "naturally" is spoken; therefore, when cognizing the hair of a tortoise, an image in the mind arises. This proves the existence of the two parts.