Plutarch on teachers

We now reach a topic more important and vital than any yet treated — that of the right teachers for our children. The kind to be sought for are those whose lives are irreproachable, whose characters are unimpugned, and whose skill and experience are of the best. The root or fountain-head of character as a man and a gentleman lies in receiving the proper education. As farmers put stakes beside their plants, so the right kind of teacher provides firm support for the young in the shape of lessons and admonitions, carefully chosen so as to produce an upright growth of character.

Plutarch, “On Bring up a Boy”