維摩經玄疏 3.41

3.41

「圓」義有八，而但名圓教者，若不因圓教，則不知圓理，乃至得成圓果也。

Although the meaning of "perfect" has eight aspects, it is simply called the "perfect teaching" because without relying on the perfect teaching, one would not know the perfect principle, up to being able to realize the perfect fruit.