8 But a lover of hospitality, a lover of good men, sober, just, holy, temperate;
[AD 100] Didache on Titus 1:5-9
Therefore, appoint for yourselves bishops and deacons worthy of the Lord, men meek, and not lovers of money, [1 Timothy 3:4] and truthful and proven; for they also render to you the service of prophets and teachers. Despise them not therefore, for they are your honoured ones, together with the prophets and teachers.

[AD 407] John Chrysostom on Titus 1:8-9
You see what intensity of virtue he required. "Not given to filthy lucre," that is, showing great contempt for money. "A lover of hospitality, a lover of good men, sober, just, holy"; he means, giving away all his substance to them that need. "Temperate"; he speaks not here of one who fasts, but of one who commands his passions, his tongue, his hands, his eyes. For this is temperance, to be drawn aside by no passion.

"Holding fast the faithful word as he has been taught." By "faithful" is here meant "true," or that which was delivered through faith, not requiring reasonings, or questionings.

"Holding fast," that is, having care of it, making it his business. What then, if he be ignorant of the learning that is without? For this cause, he says, "the faithful word, according to teaching."

"That he may be able both to exhort, and to convince the gainsayers."

So that there is need not of pomp of words, but of strong minds, of skill in the Scriptures and of powerful thoughts. Do you not see that Paul put to flight the whole world, that he was more powerful than Plato and all the rest? But it was by miracles, you say. Not by miracles only, for if you peruse the Acts of the Apostles, you will find him often prevailing by his teaching previously to his miracles.

"That he may be able by sound doctrine to exhort," that is, to retain his own people, and to overthrow the adversaries. "And to convince the gainsayers." For if this is not done, all is lost. He who knows not how to combat the adversaries, and to "bring every thought into captivity to the obedience of Christ," and to beat down reasonings, he who knows not what he ought to teach with regard to right doctrine, far from him be the Teacher's throne. For the other qualities may be found in those under his rule, such as to be "blameless, to have his children in subjection, to be hospitable, just, holy." But that which characterizes the Teacher is this, to be able to instruct in the word, to which no regard is now paid.

[AD 420] Jerome on Titus 1:8-9
"But [he should be] hospitable, a lover of good, chaste, just, holy, continent or abstinent, one who holds to the correct doctrine, faithful in speech, so that [he] is able to comfort [others] in sound doctrine and refute those who contradict it." Above all, hospitality is required of a future bishop. For if everyone wishes to hear it from the Gospel: "I was a stranger and you took me in" (Matt. 25:35): how much more should a bishop, whose house should be a common inn for everyone! For a layman receiving one or two, or a few, fulfills the duty of hospitality. If a bishop does not receive all, he is inhuman. But I fear that just as the Queen of the South came from the ends of the earth to hear the wisdom of Solomon (Matt. 12), judging the men of her own time, and the men of Nineveh, who repented at the preaching of Jonah will condemn those who disdained to hear a greater Savior than Jonah: so most people judge bishops, withdrawing themselves from the ecclesiastical rank and exercising things that do not befit a bishop; of whom I think John writes to Gaius: "Dear friend, you are faithful in whatever you do for the brothers and sisters, even though they are strangers to you. They have told the church about your love. Please send them on their way in a manner that honors God. It was for the sake of the Name that they went out receiving no help from the pagans" (3 John 5ff.). And truly, with the Holy Spirit speaking through him, [John] foretells what will happen in the churches, even then condemning those who desire to have the first place, Diotrephes, who does not receive us. Therefore, when I come, I will call attention to the works he is doing, spreading malicious nonsense about us. Not satisfied with that, he even refuses to welcome other believers. He also stops those who want to do so and puts them out of the church. Truly, it is now evident that what was predicted [has come true]: in many cities, bishops or priests, if they see laypeople being hospitable, lovers of good, [they] envy, become angry, excommunicate, and expel them from the Church, as if it were not lawful to do what the bishop does not do: and that such laypeople should be damned by the priests. Therefore, [the priests] hold them [i.e. the laypeople] in heavy burdens, and, as if imposed on their own necks, they turn them away from good work and disturb them with various persecutions. But let the bishop be chaste, whom the Greeks call σώφρονα; and the Latin interpreter, being deceived by the ambiguity of the word, translated it as "prudent" instead of "chaste". But if it is ordered for lay people to abstain from sexual intercourse during prayer, what should be thought of a bishop who will offer God the unstained victims daily for his own and the people's sins? Let us turn to the books of the Kings and find priest Abimelech who did not want to give bread to David and his men until he questioned whether they were pure from women. And unless he had heard that they had been pure from work with their wives yesterday and the day before, he would not have allowed the loaves that he had previously denied. There is as much difference between the loaves of the offering and the body of Christ as there is between shadow and body, image and truth, exemplars of the future and the very things that were foreshadowed by the exemplars. Therefore, just as meekness, patience, sobriety, moderation, renunciation of gain, hospitality, and kindness must be especially present in the bishop and outstanding among all laymen, so must personal chastity and (if I may say so) priestly modesty be present, so that the mind, which will make Christ's body, is free not only from unclean works but also from the error of the eye and thought. And the bishop also should be just and holy so that he may exercise justice among the peoples whom he presides over and give to each what he deserves, not showing partiality in judgment. The difference between laypersons and bishops in justice consists in this: a layperson can appear just in a few things, while a bishop can exercise justice in as many people as he has subjects. But sanctus, which in Greek is called ὅσιος, signifies this more: when sanctity itself is mixed with piety and refers to God. For whom we call sanctum, the Greeks call ἅγιον; but whom they call ὅσιον, we can call pious towards God. Let the bishop also be abstinent: not only (as some think) from lust and embracing his wife, but from all disturbances of the soul, so that he not be roused to anger, not be cast down by sadness, not be agitated by fear nor lifted up by excessive joy. Abstinence, moreover, has been counted among the fruits of the spirit by the Apostle. And if it is required of all, how much more from a bishop, who must bear the sins of sinners with patience and gentleness: console the fearful: sustain the weak: render no evil for evil, but overcome evil with good. Finally, let him hold fast to the faithful word which is according to doctrine, so that just as the word of God is faithful and worthy of every acceptance, so he may present himself in such a way that everything he says is considered worthy of faith, and his words are a rule of truth. Let him also be able to console those who are agitated by the turmoil of this age and to destroy weak precepts through sound doctrine. Sound doctrine is said, in distinction to weak and frail doctrine. Let him also be such that he can refute contradicting heretics or Jews and the wise of this age. And indeed, the virtues that he has placed in the bishop pertain to life. But what he says here, that he may be able to console in sound doctrine and to refute the contradicting, refers to knowledge. For if a bishop's only holy life, it can benefit him to live so. Moreover, if he is learned in doctrine and speech, he can instruct himself and others, and not only instruct and teach his own but also strike back at adversaries, who unless they are refuted and convicted, can easily pervert the hearts of the simple. This passage is against those who think it is a sin to read scriptures and who despise those who meditate day and night on the Law of the Lord, as though they were useless talkers, not realizing that the Apostle, after the catalogue of the bishop's conversation, likewise commanded doctrine.