肇論新疏 2.250

2.250

理非廣略，學貴樞機。樞機入手，眾流普會。豈可不悅？悅之又悅，故再言也。眾流，指八部般若。

Principle is neither extensive nor brief; learning values the crucial pivot. Once the crucial pivot is grasped, the various streams universally converge. How could one not be pleased? Pleased and pleased again, therefore he repeats it. "Various streams" refers to the eight divisions of the Prajñāpāramitā.