法華經義記 4.40

4.40

又有人解：「是言教中索。」又有人解：「是機中有索。」即時所習，就情明索，意在後途明三車體相。

Yet another person interprets: "It is demanding within the spoken teaching." Another interprets: "It is that there is demanding within the capacity." What we now practice clarifies demanding based on the [sons'] feelings, with the intention of clarifying the substance and characteristics of the three carts in the subsequent path.