維摩經玄疏 3.6

3.6

First, as for the sūtra collection (*sūtra-piṭaka*): regarding *sūtra*, some say it is untranslatable, while others say it can be translated, with diverse interpretations among many masters; yet most commonly it is translated as "root of dharma" (faben), which means the root of world-transcending spoken teachings, and hence is called "root of dharma"; this refers precisely to the four *Āgamas*.