妙法蓮華經玄義 6.101

6.101

部者，部別各有類從也。經者，外國云脩多羅，此云線經。線能貫穿，經能經緯，言能持法，如線如經。然《阿毘曇雜心》中，說脩多羅五義者，乃是彼論師解義，非翻名也。世俗亦對緯名經，而訓經為常。如物經亘始終，始終時別，而物無改異，不改異故，名之為常。

As for 'divisions' (aṅga), each distinct division consists of its own category. As for 'scripture' (sūtra), in foreign lands it is called *sūtra*, and here called 'thread scripture'. A thread can string together, and a warp can interweave with a weft; words can uphold the Dharma, like thread and like a warp. However, in the *Abhidharma-hṛdaya-śāstra*, five meanings of *sūtra* are explained, but those are that treatise master's explanation of its meaning, not a translation of the name. In worldly usage, 'warp' (jing) is also paired with 'weft' (wei), and *jing* is glossed as 'constant'. Just as an object persists through beginning and end—though the times of beginning and end differ, the object does not alter—because it does not alter, it is called 'constant'.