大方廣佛華嚴經疏 16.5

16.5

三宗趣者，於信門中成普賢行德而自在莊嚴，無方大用建立眾生，通貫始終該攝諸位以為其宗，令起圓融信行成位德用而為意趣。

Third, as for the central theme and orientation: within the gateway of faith, accomplishing the practice and virtues of Samantabhadra with sovereign adornment, establishing sentient beings through unfettered, vast functioning, and running throughout from beginning to end to encompass all stages constitute its central theme; causing one to give rise to consummate and interpenetrating faith and practice, thereby accomplishing the virtuous functioning of the stages, constitutes its orientation.