John Chrysostom (attributed)

That is, teaching with so pure a light, that men may not only hear your words, but see your works, that those whom as lamps ye have enlightened by the word, as salt ye may season by your example. For by those teachers who do as well as teach, God is magnified; for the discipline of the master is seen in the behaviour of the family. And therefore it follows, and they shall glorify your Father which is in heaven.