增壹阿含經 9.1.p3

9.1.p3

The monks then said, “Bhagavān, we don’t understand the meaning of this. The Bhagavān is the source of the teachings. The Tathāgata’s words are never unacceptable. Please, Bhagavān, give the monks a discourse about this profound principle. Having heard it, we’ll approve of it.”