維摩經玄疏 5.6

5.6

Second, clarifying that the name sūtra contains the sense of "subtle unfolding": the Dharma King uses the four siddhāntas to raise teachings, with skillful and profound words, proceeding from the subtle to the manifest, leaving nothing unexpressed; thus the text and meaning gradually become clear, unfolding the initial aspiration, good in the beginning, middle, and end, perfect and complete. Therefore sūtra contains the sense of "subtle unfolding".