法華玄論 9.63

9.63

答：世界悉檀，法應如是，同來影嚮，座以安身、樹以覆體，遣使問訊故將一侍者。若有所表者，法身不二故侍者唯一。

Answer: According to the mundane siddhānta, things naturally ought to be so: they come together to echo [the assembly], the throne serves to seat the body, and the tree serves to shade the form; and to send an emissary with greetings, he brings a single attendant. If it represents something: because the dharmakāya is non-dual, there is only a single attendant.