維摩經玄疏 4.32

4.32

三、明一切皆實者，無說而說，說必應機，赴緣之益，其義皆實，是故四教皆名實也。故《智度論》云「有世界、對治、為人，故實；有第一義，故實」，此即皆實不虛之義也。

Third, clarifying that all is ultimate: preaching from non-preaching, what is preached necessarily responds to capacities, and the benefit in meeting conditions is entirely real in its meaning; therefore all four teachings are called ultimate. Hence the Mahāprajñāpāramitopadeśa says: "Because of the worldly, therapeutic, and individual [siddhāntas], they are real; because of the supreme meaning, it is real"; this is the meaning of all being real and not empty.