肇論新疏 3.272

3.272

由前云眾經異說何以取中，今引《法華》明三乘一起，三雖差別，至道唯一。三位例然。

Because it was said earlier: "Given the differing explanations of the various sūtras, how is one to find the middle?", now the Saddharmapuṇḍarīka is cited to clarify that the three vehicles arise from one: although the three are distinct, the ultimate path is only one. The three positions are all like this.