8 Before I make an end of dictating (for I perceive that I have already exceeded the just limits of a letter) I wish to give a brief explanation of the previous verses of the epistle in which the apostle describes the life of him that is to be made a bishop. We shall thus recognize him as Doctor of the Nations not only for his praise of monogamy but also for all his precepts. At the same time I beg that no one will suppose that in what I write my design is to blacken the priests of the present day.
My one object is to promote the interest of the church. Just as orators and philosophers in giving their notions of the perfect orator and the perfect philosopher do not detract from Demosthenes and Plato but merely set forth abstract ideals; so, when I describe a bishop and explain the qualifications laid down for the episcopate, I am but supplying a mirror for priests. Every man's conscience will tell him that it rests with himself what image he will see reflected there, whether one that will grieve him by its deformity or one that will gladden him by its beauty.
I turn now to the passage in question. “If a man desire the office of a bishop, he desires a good work.” Work, you see, not rank; toil not pleasure; work that he may increase in lowliness, not grow proud by reason of elevation. “A bishop then must be blameless.” The same thing that he says to Titus, “if any be blameless.” All the virtues are comprehended in this one word; thus he seems to require an impossible perfection. For if every sin, even every idle word, is deserving of blame, who is there in this world that is sinless and blameless?
Still he who is chosen to be shepherd of the church must be one compared with whom other men are rightly regarded as but a flock of sheep. Rhetoricians define an orator as a good man able to speak. To be worthy of so high an honour he must be blameless in life and lip. For a teacher loses all his influence whose words are rendered null by his deeds. “The husband of one wife.” Concerning this requirement I have spoken above. I will now only warn you that if monogamy is insisted on before baptism the other conditions laid down must be insisted on before baptism too.
For it is impossible to regard the remaining obligations as binding only on the baptized and this alone as binding also on the unbaptized. Vigilant (or “temperate” for νηφαλιος means both), wise, of good behaviour, given to hospitality, apt to teach. The priests who minister in God's temple are forbidden to drink wine and strong drink, to keep their wits from being stupefied with drunkenness and to enable their understanding to do its duty in God's service. By the word 'wise' those are excluded who plead simplicity as an excuse for a priest's folly.
For if the brain be not sound, all the members will be amiss. The phrase “of good behaviour” is an extension of the previous epithet “blameless.” One who has no faults is called “blameless;” one who is rich in virtues is said to be “of good behaviour.” Or the words may be differently explained in accord with Tully's maxim, 'the main thing is that what you do you should do gracefully.' For some persons are so ignorant of their own measure and so stupid and foolish that they make themselves laughing stocks to those who see them because of their gesture or gait or dress or conversation.
Fancying that they knew what is and what is not good taste they deck themselves out with finery and bodily adornments and give banquets which profess to be elegant: but all such attempts at dress and display are nastier than a beggar's rags. As regards the obligation of priests to be teachers we bare have the precepts of the old Law and the fuller instructions given on the subject to Titus. For an innocent and unobtrusive conversation does as much harm by its silence as it does good by its example. If the ravening wolves are to be frightened away it must be by the barking of dogs and by the staff of the shepherd. “Not given to wine, no striker.” With the virtues they are to aim at he contrasts the vices they are to avoid.
Source: Letters (New Advent)