Our answer as to the reason which demanded an oath from us.
Germanus: The first reason, as we said, was that we were afraid of vexing our Elders and resisting their orders; the second was that we very foolishly believed that, if we had learned from you anything perfect or splendid to hear or look at, when we returned to the monastery, we should be able to perform it.
Source: Conferences (New Advent)