"Saint Timothy was young in years, but in character he was a venerable elder. The Apostle exhorts him: remain such that your progress in everything may present a pattern of good works. Let a discipline worthy of respect and wonder be visible in you, though you are young. Let your deeds give no sign of your age. Let all regard you not as a youth, but as an elder. Let those older in years blush if they do not show themselves, like you, venerable in conduct and character. Let the young have in you a peer as their teacher. This youth is wondrous, most holy Timothy, since his example had power to restrain undisciplined youth and to convict old age that did not preserve its proper dignity" (Ambrosiaster).
"Let no one despise," μη καταφρονειτω, means: let no one despise your youth, or you because of your youth. Since one cannot force others not to despise, the Apostle's meaning is this: do not bring yourself to the point where you are despised. Give no occasion for contempt or disrespect.
The following words show how this is achieved: "but be an example." "Show a life adorned with good character, and your youth will not be despised. On the contrary, it will draw universal admiration" (blessed Theophylact). "So long as you lead a life fitting your rank, no one will despise you for your age. Rather, everyone will admire you still more" (Chrysostom).
This may also have the following meaning here. Conscious of your youth, do not keep silence or pass things over when you must speak, rebuke, correct, and act with authority. If you allow this, the disorderly before your eyes will begin to behave lawlessly, counting your authority as nothing.
Then they will despise not you, Timothy, but the bishop in your person. They will despise the apostolic authority entrusted to him to build up the holy Church. This must by no means be allowed. "The teacher must not be held in contempt" (Chrysostom). "The bishop, acting as bishop, must speak and reason with authority" (Oecumenius). "Command what is required with authority, and no one will despise you" (blessed Theophylact).
But how will the bishop show the meekness commanded of him above (see 1 Tim 3:3)? Chrysostom says: "Where, you ask, is meekness, if he never experiences contempt? In matters that concern him personally, let him endure contempt when he suffers it. In this way his longsuffering will aid the success of his teaching. But in what concerns the salvation of others, no. That would no longer be meekness, but indifference. When he avenges insults, slanders, or accusations directed against himself, he is rightly blamed. But when the salvation of others is at stake, then command and direct with full authority. Here what is needed is not meekness, but authority, lest this become destructive to the community."
"But be an example to the faithful." "In everything offer yourself as an example of good works. That is, be yourself the archetype in life, appearing before others as an animate law, as a rule and ordinance of the good life. Such must the teacher be" (Chrysostom).
"In word" may mean in the teacher's word, that is, "in saying what one must say as a teacher. You see that a teacher must prepare the word, or have it ready" (Oecumenius), "so as to speak with ease" (blessed Theophylact), and "so as to enter conversation without difficulty" (Chrysostom).
Or it may mean ordinary speech in mutual dealings, conversations, and discussions, so that both the content and the manner of speech are edifying. In that case the same thing is recalled here which is said elsewhere to all: "Let no corrupt word proceed out of your mouth, but only what is for edification, that it may give grace to those who hear" (cf. Eph 4:29). This thought is closer to the course of the discourse.
"In conduct," εν αναστροφη, means in mutual dealings, or in one's manner of bearing oneself in meetings and relations with others, according to place, time, persons, and one's own rank. This applies fittingly to domestic, civil, and ecclesiastical orders of life and relations, "in ordinary life and in church order" (blessed Theophylact).
The general law here is to meet everyone with respect and with readiness to do every good for him, by word and deed, allowing no license in one's manner of dealing.
"In love," which embraces all as brothers and sisters (Oecumenius, blessed Theophylact). Love must breathe also in mutual dealings. Yet there a certain manner of dealing may seem loving without truly being so. Therefore the Apostle enters within the heart and enthrones love there as queen of all actions, love as a feeling, so that loving deeds may proceed from it.
A pastor, receiving the flock into his hands, must receive all as his own children by blood and as kin. He must care for all as for those who are his own.
"In spirit" means "either in spiritual disposition, or in the gift of the grace of the Holy Spirit" (Oecumenius, blessed Theophylact). In the first sense, one must be detached from everything created and sensory, and have one's life hidden in God (see Col 3:3). One must do all for His glory, according to His will, in His presence, with fear and reverence.
In the second sense, one must "not be exalted by the gift of the grace of the Holy Spirit" (Oecumenius, blessed Theophylact). Rather, one must humble oneself, fearing lest one prove less active and fruitful than one should, judging by the gift given.
"In faith" means "right and unwavering faith, when one believes God even in what is impossible in the natural order" (Oecumenius, blessed Theophylact). There are two forms of faith. The first is right faith, receiving without doubtful thoughts all that God has revealed to us. The second is faith assured in God, that He will not abandon the one who has surrendered himself to Him, and that He will bring him to the desired end, eternal blessedness, whatever his condition here on earth.
The first faith reigns in the intellectual sphere. The second reigns in active life. Through this latter faith one receives admonitions, strengthening of moral energy, and deliverance from circumstances difficult and dangerous for purity of heart and conscience.
Its summit is that faith of which the Savior says: "He who believes in Me, the works that I do he will do also" (Jn 14:12). Again: "Whatever you ask in prayer, believing, you will receive" (cf. Mt 21:22). Or: "Whatever things you ask when you pray, believe that you receive them, and it will be yours" (Mk 11:24).
"In purity," εν αγνεια, means in chastity, "in virginal purity and chastity" (Chrysostom, Oecumenius, blessed Theophylact). Saint Timothy was a virgin in body. By this he was being instructed only in virginity of heart, which one may lack even with bodily virginity, when one is not indifferent to female beauty, even without lustful desires.
One who lives in the spirit, as indicated by the word "in spirit," must be detached even from this. He must regard all women as sisters. Thus every preference for any one of them, not according to her spiritual dignity, is removed, as is any attachment to her merely because of outward attractiveness.