The Long Āgama Sūtra 30.10

30.10

佛告諸比丘言：「善哉！善哉！凡出家者應行二法：一賢聖默然，二講論法語。汝等集在講堂，亦應如此賢聖默然，講論法語。諸比丘！汝等欲聞如來記天地成敗、眾生所居國邑不耶？」

The Buddha told the monks, “Good, good! Everyone who’s left home should practice two things: The first is the noble silence, and the second is [the noble] discussion of the Dharma. When all of you gather in a meeting hall, you should practice noble silence or [noble] discussion of the Dharma. Monks, would you like to hear the Tathāgata describe the formation and destruction of heaven and earth and the cities and countries where sentient beings live?”