大方廣圓覺修多羅了義經略疏 1.280

1.280

稱性之眾必具主伴，如《華嚴》說。此約自他融攝；若但約自心，即智度為母等。

An assembly in accord with the nature must possess both principal and companions, as explained in the Huayan [Sūtra]. This is in terms of mutual integration of self and other; if considered solely in terms of one's own mind, the perfection of wisdom is the mother, and so forth.