法華義疏 3.35

3.35

亦得爾也。故《勝鬘經》云「一乘大方便」，即是諸佛大善巧。《勝鬘》明一乘而題稱一乘大方便，《法華》開宗之首亦宜用一乘為方便也。

That is also permissible. Hence the Śrīmālādevī Sūtra says, "the great upāya of the ekayāna," which is the great skillfulness of the Buddhas. The Śrīmālādevī illuminates the ekayāna while its title calls it "the great upāya of the ekayāna"; at the head of the Lotus Sūtra's revelation of its doctrine, it is also fitting to employ the ekayāna as upāya.