華嚴經探玄記 4.81

4.81

三宗者，明普賢行位體及相用廣大無邊、始終俱括，應在信門該攝諸位成佛妙果，是此所明也。

Third, the central theme: To clarify that the substance, characteristics, and functions of the stages of Samantabhadra's practice are vast and boundless, encompassing both the beginning and the end; they should encompass the various stages within the gate of faith to accomplish the wondrous fruit of Buddhahood. This is what is clarified here.