“Even so let your light shine before other, in order that they may see your good works and give glory to your Father in heaven.” That is to say, so shine and teach, not only that people may hear your words but also that they may see your good works. Let those you illumine by the light of your words be seasoned by the salt of your works. For the one who teaches and practices what he teaches, teaches truly. But one who does not practice what he teaches does not teach anyone but casts a bad light on himself. And it is better to practice and not to teach than to teach and not to practice. Because one who practices, though he may keep silent, corrects some people by his example. But one who teaches and does not practice not only corrects no one but even scandalizes many. For who is not tempted to sin when he sees the teachers of goodness committing sins? Therefore the Lord is magnified through those teachers who teach and practice. He is blasphemed through those who teach and do not practice. …

The church leader should be equipped with all the virtues. He should be poor, so that he can chastise greed with a free voice. He should always be someone who sighs at inordinate pleasure, whether in himself or in others. He is ready to confront those who do not hesitate before they sin and those who do not feel sorry for having sinned after they sin. So let him sigh and lament. Let him show thereby that this world is difficult and dangerous for the faithful. He should be somebody who hungers and thirsts for justice, so that he might have the strength confidently to arouse by God’s Word those who are lazy in good works. He knows how to use the whip of rebuke, but more by his example than by his voice. He should be gentle. He rules the church more by mercy than by punishment. He desires more to be loved than feared. He should be merciful to others but severe with himself. He sets on the scales a heavy weight of justice for himself but for others a light weight. He should be pure of heart. He does not entangle himself in earthly affairs, but more so he does not even think of them.

Anonymous, Incomplete Work on Matthew, Homily 10, quoted in Manlio Simonetti (ed), Matthew 1-13 (Ancient Christian Commentary on Scripture), 95.