The Long Āgama Sūtra 13.4

13.4

爾時，阿難在閑靜處，作是念言：「甚奇！甚特！世尊所說十二因緣法之光明，甚深難解，如我意觀，猶如目前，以何為深？」於是，阿難即從靜室起，至世尊所，頭面禮足，在一面坐，白世尊言：「我向於靜室，默自思念：『甚奇！甚特！世尊所說十二因緣法之光明，甚深難解，如我意觀，如在目前，以何為深？』」

It was then that Ānanda was staying in a quiet place and thought, “Amazing! Extraordinary! The twelve dependent originations that are taught by the Bhagavān are the light of the teaching\! They are profound and difficult to understand, but my mind observes them as though they were right in front of my eyes. Why are they so profound?”

Ānanda then emerged from his quiet room, went to the Bhagavān, bowed his head at his feet, and sat to one side. He said to the Bhagavān, “I was in a quiet room and thought to myself, ‘Amazing! Extraordinary! The twelve dependent originations that are taught by the Bhagavān are the light of the teaching! They are profound and difficult to understand, but my mind observes them as though they were right in front of my eyes. Why are they so profound?’”