Let few of you be teachers
[Syncletica] also said, “It is dangerous for a man to try teaching before he is trained in the good life. A man whose house is about to fall down may invite travellers inside to refresh them, but instead they will be hurt in the collapse of the house.
“It is the same with teachers who have not carefully trained themselves in the good life; they destroy their hearers as well as themselves. Their mouth invites to salvation, their way of life leads to ruin.”
– De vitis Patrum, Sive Verba Seniorum, Liber V