維摩經玄疏 5.8

5.8

Fourth, sūtra containing the sense of "marking-cord": this is also revealing the meaning by way of a metaphor, like the marking-cord of the world, which can cut away the crooked and make it straight. The Buddha uses the four siddhāntas to preach the Dharma, trimming away the crookedness of treatises based on craving and views, causing them to generate true views and the undefiled noble path. Therefore sūtra contains the sense of "marking-cord".