大般涅槃經集解 10.141

10.141

案僧亮曰：此舉中品比丘也。寶亮曰：昔以持律為上品，今云是中品者，以其不能廣利於物，自守而已故也。

Sengliang comments: This adduces the middling grade monk. Baoliang says: Formerly, keeping the Vinaya was regarded as the superior grade; now it is said to be the middling grade because he cannot broadly benefit beings, merely keeping to himself.