The interpretation timeline
Titus 2:7 Douay-Rheims

In all things shew thyself an example of good works, in doctrine, in integrity, in gravity,

A.D. 311 – 1871 10 witnesses

Patristic

before A.D. 750
311
A.D.
d. A.D. 311
“For when the blessed apostle Paul had undergone many persecutions, and had shown forth the prizes of many contests, though he knew that it was far better to "depart, and to be with Christ," yet he brings this forward, and says, "Nevertheless to abide in the flesh is more needful for you." For considering not his own advantage but the advantage of many, that they might be saved, he judged it more necessary than his own rest to remain with the brethren, and to have a care for them; who also would have him that teacheth to be "in doctrine" an example to the faithful.”
Source
367
A.D.
Hilary of Poitiers Patristic
c. A.D. 310–367
“Finally, Paul instructed Titus, whom he addresses directly about attaining perfection in the practice of the true religion, in this admonition: "Show yourself in all respects a model of good deeds, and in your teaching show integrity, gravity and sound speech that cannot be censured, so that an opponent may be put to shame, having nothing evil to say of us." This teacher of the Gentiles and the chosen leader of the church, conscious of Christ who spoke and dwelt within him, knew that the plague of a deadly eloquence would rise up against him.… For this reason, he wished the bishop to possess learning, the consciousness of the faith and the knowledge of argument that would withstand godless lying and insane objections.”
Source
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“Ver. 7. "In all things showing thyself a pattern of good works." Let the elder women, he says, teach the younger, but do thou thyself exhort young men to be soberminded. And let the luster of thy life be a common school of instruction, a pattern of virtue to all, publicly exhibited, like some original model, containing in itself all beauties, affording examples whence those who are willing may easily imprint upon themselves any of its excellences. Ver. 7, 8. "In [thy] doctrine showing uncorruptness, gravity, sincerity, Sound speech that cannot be condemned; that he that is of the contrary part may be ashamed, having no evil thing to say of you." By "him that is of the contrary part," he means the devil, and every one who ministers to him. For when the life is illustrious, and the discourse corresponds to it, being meek and gentle, and affording no handle to the adversaries, it is of unspeakable advantage. Of great use then is the ministry of the word, not any common word, but that which is approved, and cannot be condemned, affording no pretext to those who are willing to censure it.”
Source
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“As far as we are concerned, our consciences are all that matters. As far as you are concerned, our reputation among you ought not to be tarnished but influential for good. Mark what I've said, and make the distinction. There are two things, conscience and reputation; conscience for yourself, reputation for your neighbor. Those who, being clear in their consciences, neglect their reputations, are being cruel; especially if they find themselves in this position. The apostle writes about this to his disciple: "Showing yourself to all around you as an example of good works."”
Source

Scholastic

c. 1100 – 1500
1273
A.D.
Thomas Aquinas Catholic
1225–1274
“Above, the Apostle taught Titus concerning the matters in which he should instruct the free subjects. And because not only words are profitable, but also examples, therefore he teaches him to offer himself as an example: first in general; second specifically, at the place "in doctrine"; third he assigns the reason for this, at the place "that he who is of the...," et cetera. He says therefore: because you are young in age, show yourself as an example to all in good works. For a prelate ought to be, as it were, a form existing for his disciples. 1 Cor. 11:1: "Be imitators of me, as I also am of Christ." John 13:15: "I have given you an example," et cetera. Then when he says "in doctrine," he sets down the particulars in which he ought to show himself an example: first he shows what his act ought to be, namely in doctrine; hence he says "in doctrine." For this is proper to a prelate. Jer. 3:15: "I will give you shepherds according to my heart, and they will feed you with knowledge and doctrine." And it especially befits him, as one who has other bishops under him, as is said above, 1:5: "that you appoint bishops," et cetera. Therefore, in teaching others, he ought to offer them an example of doctrine. 1 Tim. 4:16: "Attend to yourself and to doctrine." Likewise he admonishes him as to life; and first, to turn away from evil. Is. 1:16: "Cease to act perversely." And therefore he says "in integrity," that is, through incorruption. For just as the body loses its integrity through the corruption of its members, so the soul loses it through the corruption of sin. Now in a prelate there is integrity of sense through prudence, of affection through charity, of body through chastity. Thess., last chapter: "May your spirit, and soul, and body be kept whole, without complaint, at the coming of our Lord Jesus Christ." Second, that he be grave as to the good things which are done with charity. Now "grave" has two senses: one, in that it descends, and according to this it is blamed. Ps. 4:3: "Sons of men, how long will you be heavy of heart," etc.; the other is, that it is stable and firm. And therefore those are called grave who are not easily moved from the good; thus here when he says "in gravity," and this is commended. Ps. 34:18: "In a grave people I will praise you." Then he shows what sort his doctrine and word ought to be. And he says that it ought to be sound, that is, not corrupted by falsity. 2 Tim. 1:13: "Hold the form of sound words, which you have heard from me in faith," et cetera. Prov. 17:7: "A lying lip does not become a prince." Likewise as to manner, when he says "irreprehensible," that is, that it be uttered in its own time, and with all decency and provocation to correction. Ecclus. 20:22: "A parable is rejected from the mouth of a fool; for he will not say it in its own time." Now the end of the doctrine is that he who is of the contrary part may be ashamed, etc., as if he were to say: if all conduct themselves well, namely prelates and subjects, adversaries cannot harm you. 1 Pet. 2:15: "For so is the will of God, that by doing good you may put to silence the ignorance of foolish men." 1 Tim. 5:14: "To give no occasion to the adversary for the sake of reviling." Then when he says "servants," he teaches how he should instruct servants; and first he does this; second he assigns the reason for it, at the place "has appeared." Concerning the first he does three things: first he leads servants to subjection; second he determines the manner of it, at the place "in all things"; third he shows the necessity of this teaching, at the place "that the doctrine." He says therefore: admonish servants to be subject to their masters. 1 Pet. 2:18: "Servants, be subject in all fear to your masters, not only to the good and gentle, but also to the harsh." Col. 3:22: "Servants, obey in all things your masters according to the flesh, not serving to the eye," et cetera. He says the same in Ephesians 6:5. And why does the Apostle admonish this so frequently? I respond: Not without cause. For a heresy began among the Jews, that the servants of God ought not to serve men; and from this it was also derived into the Christian people, that they said that, having been made sons of God through Christ, they ought not to be servants of men. But Christ did not come through faith to take away the order of justice; rather, through the faith of Christ justice is preserved. Now justice makes some subject to others. But servitude of this kind is as to the body. For through Christ we are now freed from servitude as to the soul, but not from the servitude, nor from the corruption, of the body; but in the future we shall be freed also from the corruption and bodily servitude. 1 Cor. 15:24: "When he shall have delivered up the kingdom to God and the Father," et cetera. But what he says, "in all things," can be referred first to what he says, "subject," so that it be understood "in all things," namely to whatever the right of dominative power extends; or to what he says, "pleasing." For there ought to be subjection: first, that they serve without offense, not with murmuring and slowness. Col. 1:10: "In all things pleasing to God." 1 Cor. 10:33: "I in all things please all men." On the contrary, Gal. 1:10: "If I pleased men, I would not be a servant of Christ." I respond: To please a man for his own sake is blameworthy, but for God's sake it is praiseworthy. Second, that they be without contradiction; therefore he says, "not contradicting." Ecclus. 4:30: "Do not contradict the word of truth." Third, without fraud; hence he says, "not defrauding." Where he removes one thing, and establishes another. He removes fraud; for the goods of masters are entrusted to servants. Luke 19: "He delivered to them his goods." He establishes goodness in all things; and therefore he says, "but in all things showing good faith." But to what end are these things to be done? Not indeed for the sake of earthly favor, but for the glory of God; hence he says, "that they may adorn the doctrine of our Savior, our Lord," et cetera. The Gloss: The ornament of a teacher is the honest life of the disciple, just as the health of the sick person is the praise of the physician. The teacher is the curer of souls. If therefore we show forth good works, the doctrine of Christ is praised. Is. 52:5: "Continually, all the day, my name is blasphemed." Matt. 5:16: "That they may see your good works," et cetera.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Exhort servants to be obedient to their own masters,.... And not others, whether they be believers, or unbelievers, gentle or froward, all their lawful commands ought to be obeyed; See Gill on Eph 6:5 and to please them well in all things; not only to obey and serve them, and do what they order, but to seek and endeavour to do it in such a way as may be grateful, acceptable, and well pleasing to them, whereby an interest in their affection, esteem, and commendation, may be gained: and this should be done always, and in all things, that are not contrary to a good conscience and to the Christian religion, and to the laws of God and nature. Or "that they may be well pleased in all things"; that is, be satisfied and contented with such things as they have, and in their state and condition as servants, and cheerfully abide in the calling wherein they are called: not answering again; replying to their masters' orders, or complaints, either in a pert, or saucy, or grumbling manner; an evil very incident to servants, and which greatly provokes.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“In all things showing thyself a pattern - As the apostle had given directions relative to the conduct of old men, Tit 2:2, of old women, Tit 2:3, of young women, Tit 2:4, and of young men, Tit 2:6, the words περι παντα, which we translate in all things, should be rather considered in reference to the above persons, and the behavior required in them: showing thyself a pattern of good works to all these persons - being, in sobriety, gravity, temperance, what thou requirest others to be. In doctrine showing uncorruptness - Mixing nothing with the truth; taking nothing from it; adding nothing to it; and exhibiting it in all its connection, energy, and fullness.”
Source
1849
A.D.
1774–1849
“In gravity: to which is added in the Protestant translation sincerity, [2] from some Greek copies; but it is left out by Dr. Wells, as being not in the best Greek manuscripts nor is it in the Amsterdam edition, (1711.) (Witham)”
1863
A.D.
1796–1863
“G. P. "in doctrine showing uncorruptness, gravity, sincerity." There are great varieties in the readings.”
1871
A.D.
1871
“In--with respect to all things. thyself a pattern--though but a young man thyself. All teaching is useless unless the teacher's example confirm his word. in doctrine--in thy ministerial teaching (showing) uncorruptness, that is, untainted purity of motive on thy part (compare Co2 11:3), so as to be "a pattern" to all. As "gravity," &c., refers to Titus himself, so "uncorruptness"; though, doubtless, uncorruptness of the doctrine will be sure to follow as a consequence of the Christian minister being of simple, uncorrupt integrity himself. gravity--dignified seriousness in setting forth the truth. sincerity--omitted in the oldest manuscripts.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.