三彌勒經疏 1.16

1.16

問：慶喜于時亦見覺知如來所說，何故不言我見覺知？答：亦有三義。一欲證理必先聞故、二此界以聲作佛事故、三希證菩提必重心聞故。總云傳法者，眾生令恭敬信受故。如是法我從佛聞，文義決定，無所增減故，故如是我聞也。

Question: Ānanda at that time also saw, perceived, and knew what the Tathāgata spoke; why does he not say 'I saw, perceived, and knew'? Answer: There are also three reasons. First, wishing to realize the principle, one must first hear it. Second, in this realm the Buddha's work is performed through sounds. Third, hoping to realize bodhi, one must prioritize hearing with respect. In general, for the transmitter of the Dharma, in order to make sentient beings revere, have faith in, and accept it [he says]: 'Such Dharma I heard from the Buddha; the text and meaning are definitive, with nothing added or subtracted.' Therefore [it says], 'Thus have I heard.'