The interpretation timeline
1 John 2:13 Douay-Rheims

I write unto you, fathers, because you have known him, who is from the beginning. I write unto you, young men, because you have overcome the wicked one.

A.D. 215 – 1871 6 witnesses

Patristic

before A.D. 750
215
A.D.
c. A.D. 150–215
“By "fathers" John means those perfect people who understood everything from the very beginning and readily perceived that the Son had always existed. He styles "fathers" the perfect, "who have known what was from the beginning," and received with understanding - the Son, that is, of whom he said above, "that which was from the beginning." "I write," says he, "to you, young men, because ye have overcome the wicked one." Young man strong in despising pleasures. "The wicked one" points out the eminence of the devil. "The children," moreover, know the Father; having fled from idols and gathered together to the one God.”
Source
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“"I write unto you, fathers." Why first sons? "Because your sins are forgiven you through His name," and ye are regenerated into a new life, therefore sons. Why fathers? "Because ye have known Him that is from the beginning:" for the beginning hath relation unto fatherhood. Christ new in flesh, but ancient in Godhead. How ancient think we? how many years old? Think we, of greater age than His mother? Assuredly of greater age than His mother, for "all things were made by Him." If all things, then did the Ancient make the very mother of whom the New should be born. Was He, think we, before His mother only? Yea, and before His mother's ancestors is His antiquity. The ancestor of His mother was Abraham; and the Lord saith, "Before Abraham I am." Before Abraham, say we? The heaven and earth, ere man was, were made. Before these was the Lord, nay rather also is. For right well He saith, not, Before Abraham I was, but, "Before Abraham I Am." For that of which one says, "was," is not; and that of which one says, "will be," is not yet: He knoweth not other than to be. As God, He knoweth "to be:" "was," and "will be," He knoweth not. It is one day there, but a day that is for ever and ever. That day yesterday and tomorrow do not set in the midst between them: for when the 'yesterday' is ended, the 'to-day' begins, to be finished by the coming 'tomorrow.' That one day there is a day without darkness, without night, without spaces, without measure, without hours. Call it what thou wilt: if thou wilt, it is a day; if thou wilt, a year; if thou wilt, years. For it is said of this same, "And thy years shall not fail." But when is it called a day? When it is said to the Lord, "To-day have I begotten Thee." From the eternal Father begotten, from eternity begotten, in eternity begotten: with no beginning, no bound, no space of breadth; because He is what is, because Himself is "He that Is." This His name He told to Moses: "Thou shalt say unto them, He that is hath sent me unto you." Why speak then of "before Abraham"? why, before Noe? why, before Adam? Hear the Scripture: "Before the day-star have I begotten Thee." In fine, before heaven and earth. Wherefore? Because "all things were made by Him, and without Him was nothing made." By this know ye the "fathers:" for they become fathers by acknowledging "That which is from the beginning." "I write unto you, young men." There are sons, are fathers, are young men: sons, because begotten; fathers, because they acknowledge the Beginning; why young men? "Because ye have overcome the wicked one." In the sons, birth: in the fathers, antiquity: in the young men, strength. If the wicked one is "overcome" by the young men, he fights with us. Fights, but not conquers. Wherefore? Because we are strong, or because He is strong in us who in the hands of the persecutors was found weak? He hath made us strong, who resisted not His persecutors. "For He was crucified of weakness, but He liveth by the power of God."”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“I write unto you, fathers,.... Not merely in age, though they might be men in years who are here intended, or only with respect to their long standing in the church, which might be the case; though persons may be in years, and of a long standing in the church, and yet be children in knowledge and experience: but here it designs such, who, in comparison of others, were perfect, and were spiritual, and judged all things; had a well informed and established judgment in divine things, and were, in understanding, men, fathers, and not babes in Christ; so the Jews used to call their men of wisdom, and knowledge, and understanding, "Abot", "fathers". Hence there is a whole treatise in the Misna called Pirke Abot, which contains the apophthegms, wise sayings, and sentences of their fathers, or wise men. Now the apostle writes the new commandment of love, and urges it on these, for this reason, because ye have known him that is from the beginning; either God the Father, who is from everlasting to everlasting, the Ancient of days, the eternal I AM, whom to know is life eternal; whose everlasting love to them, whose covenant of grace with his Son for them, before the world was, and the ancient transactions, and settlements of his grace on their account, they were acquainted with: or Jesus Christ, the Logos or Word, which was from the beginning, who existed from all eternity, as a divine person, as the Son of God, co-eternal with the Father; as the eternal choice made in him, and the everlasting covenant with him show; and who in his office capacity, as Mediator, was set up from everlasting; and who, with respect to the virtue of his blood, righteousness, and sacrifice, was from the beginning of the world, and was the same yesterday, today, and for ever; it being by his blood that all the patriarchs, from the beginning of time, were pardoned, and by his righteousness they were justified, and by his grace they were saved; all which, respecting the antiquity of Christ's person, office, and grace, was known to these fathers: they knew him, so as to approve of him, trust in him, and appropriate him to themselves, and which obliged them to the new commandment of love, not only to God and Christ, but to one another; and the reason here given, engaging to it, is exceeding suitable to their character, it being what fathers and aged men delight in, even ancient things, to call them to remembrance, to talk of them as things well known unto them; but nothing is more ancient than what is here instanced in, and nothing so honourable and profitable to know as this, or to be gloried in; and therefore the argument from hence to love those that belong to him, who is the everlasting Father, is very strong and forcible. I write unto you, young men; who are warm and zealous for God, for his cause and interest, for the glory of a Redeemer, for his truths and ordinances; and are lively in the exercise of grace, and fervent in the discharge of duty; and are active, diligent, and industrious, always abounding in the work of the Lord; and are strong and robust, able to go alone, to walk by faith, being strong in it, and in the grace that is in Christ, and do not need the staff that old age does, nor the hand to lead and teach to go, as children do: to these the apostle writes the new commandment of love, for this reason, because ye have overcome the wicked one; Satan, who is eminently so, being the first that was, and the worst that is so; for he is wickedness itself, he is wholly, entirely, immutably, and unalterably wicked; and his whole work and employment is in wickedness. Now these young men had overcome him, not only in Christ their head, who has spoiled him, destroyed him, and led him captive in triumph, in whom they were more than conquerors; but in themselves, through the power of divine grace, holding up, and making use of the shield of faith against him, whereby they quenched his fiery darts, and got the victory over him: and this is also said in perfect agreement with the character of young men, who are apt to glory in their strength, and are fond of getting the advantage, or a victory over others; and which is used to teach such as are so in a spiritual sense, not to glory in their strength, but in the Lord; and to love him whom they know, and whose lovingkindness is exercised towards them, and in Christ; and to love him through whom they get the victory, and to bear the infirmities of weaker saints, to whom they should be strongly affected. I write unto you, little children; or babes in Christ, such as were newborn babes, just born again, not able to go alone, or walk by faith, but were dandled on the knee, and lay at the breasts of divine consolation: could speak but stammeringly, and not plain, it being as much as they could do to say "Abba", Father. To these the apostle writes, and urges the new commandment of love, for this reason, because ye have known the Father: the Father of Christ, and him, as their Father in Christ, under the witnessings of the spirit of adoption; so as, in some good measure, to hope and believe he was their Father, and to love, honour, and obey him as such, to apply to him for whatever they stood in need of, and always to put themselves under his care and protection: and a consideration of this their relation to him, and interest in him, is a strong and prevailing argument why they should not only love him, their Father, and Christ, who is begotten of him, but also all the saints, who are the children of this their Father, and their brethren; and very aptly does the apostle mention their knowledge of the Father as suitable to their age and character, it being one of the first and most necessary things for a child to know.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“I write unto you, fathers - By fathers it is very likely that the apostle means persons who had embraced Christianity on its first promulgation in Judea and in the Lesser Asia, some of them had probably seen Christ in the flesh; for this appears to be what is meant by, Ye have known him from the beginning. These were the elders and eye witnesses, who were of the longest standing in the Church, and well established in the truths of the Gospel, and in Christian experience. But τον απ' αρχης, him who is from the beginning, may mean Jesus Christ in the eternity of his nature, see Joh 1:1, Joh 1:2; but the sense is the same. I write unto you, young men - These were confirmed disciples of Christ; persons who were well-grounded in the truth, had been thoroughly exercised in the Christian warfare, were no longer agitated by doubts and fears, but had arrived at the abiding testimony of the Spirit of God in their consciences; hence they are said to have overcome the wicked one, Jo1 2:14. They were persons in the prime of life, and in the zenith of their faith and love. I write unto you, little children - Παιδια, a very different term from that used in the 12th verse, τεκνια, which means beloved children, as we have already seen. This is another class, and their state is differently described: Ye have known the Father. If the apostle does not use these two words indifferently, four states instead of three, are here described: - 1. Fathers, πατερες· those who had been converted at the very commencement of Christianity, and had seen the eternal Word manifested in the flesh. 2. Young Men, νεανισκοι· youths in the prime of their spiritual life, valiant soldiers, fighting under the banner of Christ, who had confounded Satan in his wiles, and overcome him by the blood of the Lamb. 3. Little Children, παιδια· disciples of Christ, not of very long standing in the Church, nor of much experience, but who had known the Father; i.e. persons who had been made sons: God had sent the Spirit of his Son into their hearts, whereby they cried Abba, Father! 4. Beloved Children, τεκνια· the most recent converts, and particularly those among young men and women who, from their youth, simplicity, openheartedness, and affectionate attachment to God and his cause, were peculiarly dear to this aged apostle of Jesus Christ. These are represented as having their sins forgiven them on account of his name, δια το ονομα αυτου, that is, for the sake of Jesus, or on account of his merit or worthiness. These four classes constituted the household or family of God; each class, in ascending gradation, seems to have had more light, experience, and holiness than the other. 1. The τεκνια, beloved children, or infants, are those who are just born into the heavenly family. 2. The παιδια, little children, are those who are able to walk and speak; they know their heavenly Father, and can call him by that name. 3. The νεανισκοι, young men, are such as are grown up to man's estate; these perform the most difficult part of the labor, and are called to fight the battles of the Lord. 4. The πατερες, fathers, are those who are at the foundation of the spiritual family, and have known the whole economy of the work of God in themselves and in others. These have the largest stock of spiritual wisdom and religious experience. All these answer to the component members of a perfect human family. 1. There is the beloved infant dandled on the knees of its parents. 2. There are the little children that can speak a little, run about, answer to their own names, distinguish and call on their father and mother, and are now put under instruction. 3. There are the youths, those who are grown up to man's estate, are strong to labor, retain the instructions they have received, act upon them, and are occasionally called upon to defend their family, property, and country, against spoilers and oppressors. 4. There are the parents, the father and mother, from whom the family sprang, and who are the governors and directors of the household. To these four classes, in a perfect family, the apostle appears to allude; and we see, considered in this light, with what delicacy and propriety he uses these images.”
Source
1871
A.D.
1871
“All three classes are first addressed in the present. "I write"; then in the past (aorist) tense, "I wrote" (not "I have written"; moreover, in the oldest manuscripts and versions, in the end of Jo1 2:13, it is past, "I wrote," not as English Version, "I write"). Two classes, "fathers" and "young men," are addressed with the same words each time (except that the address to the young men has an addition expressing the source and means of their victory); but the "little sons" and "little children" are differently addressed. have known--and do know: so the Greek perfect means. The "I wrote" refers not to a former Epistle, but to this Epistle. It was an idiom to put the past tense, regarding the time from the reader's point of view; when he should receive the Epistle the writing would be past. When he uses "I write," he speaks from his own point of view. him that is from the beginning--Christ: "that which was from the beginning." overcome--The fathers, appropriately to their age, are characterized by knowledge. The young men, appropriately to theirs, by activity in conflict. The fathers, too, have conquered; but now their active service is past, and they and the children alike are characterized by knowing (the fathers know Christ, "Him that was from the beginning"; the children know the Father). The first thing that the little children realize is that God is their Father; answering in the parallel clause to "little sons . . . your sins are forgiven you for His name's sake," the universal first privilege of all those really-dear sons of God. Thus this latter clause includes all, whereas the former clause refers to those more especially who are in the first stage of spiritual life, "little children." Of course, these can only know the Father as theirs through the Son (Mat 11:27). It is beautiful to see how the fathers are characterized as reverting back to the first great truths of spiritual childhood, and the sum and ripest fruit of advanced experience, the knowledge of Him that was from the beginning (twice repeated, Jo1 2:13-14). Many of them had probably known Jesus in person, as well as by faith.”
Source

Undated

date unknown
date
unknown
Glossa Ordinaria Medieval
“Young men. The time of youth is slippery because of the incitements of the flesh; but because of the strength of that age it is fit for the contest, and these have overcome the temptations of pleasures by the love of the word of God, and have despised persecutions.”
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.