The interpretation timeline
1 John 3:7 Douay-Rheims

Little children, let no man deceive you. He that doth justice is just, even as he is just.

A.D. 108 – 1871 6 witnesses

Patristic

before A.D. 750
108
A.D.
c. A.D. 50–107
“None of these things is hid from you, if ye perfectly possess that faith and love towards Christ Jesus which are the beginning and the end of life. For the beginning is faith, and the end is love. Now these two, being inseparably connected together, are of God, while all other things which are requisite for a holy life follow after them. No man [truly] making a profession of faith sinneth; nor does he that possesses love hate any one. The tree is made manifest by its fruit; so those that profess themselves to be Christians shall be recognised by their conduct. For there is not now a demand for mere profession, but that a man be found continuing in the power of faith to the end.”
Source
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“"Little children, let no man seduce you. He that doeth righteousness is righteous, as He is righteous." What, on hearing that we are "righteous as He is righteous," are we to think ourselves equal with God? Ye must know what means that "as:" thus he said a while ago, "Purifieth himself even as He is pure." Then is our purity like and equal to the purity of God, and our righteousness to God's righteousness? Who can say this? But the word "as," is not always wont to be used in the sense of equality. As, for example, if, having seen this large church, a person should wish to build a smaller church, but with the same relative dimensions: as, for example, if this be one measure in width and two measures in length, he too should build his church one measure in width and two measures in length: in that case one sees that he has built it "as" this is built. But this church has, say, a hundred cubits in length, the other thirty: it is at once "as" this, and yet unequal. Ye see that this "as" is not always referred to parity and equality. For example, see what a difference there is between the face of a man and its image from a mirror: there is a face in the image, a face in the body: the image exists in imitation, the body in reality. And what do we say? Why, "as" there are eyes here, so also there; "as" ears here, so ears also there. The thing is different, but the "as" is said of the resemblance. Well then, we also have in us the image of God; but not that which the Son equal with the Father hath: yet except we also, according to our measure, were "as" He, we should in no respect be said to be like Him. "He purifieth us," then, "even as He is pure:" but He is pure from eternity, we pure by faith. We are "righteous even as He is righteous;" but He is so in His immutable perpetuity, we righteous by believing on One we do not see, that so we may one day see Him. Even when our righteousness shall be perfect, when we shall be equal to the angels, not even then shall it be equalled with Him. How far then is it from Him now, when not even then it shall be equal!”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Little children, let no man deceive you,.... Neither by these doctrines, nor by wicked practices, drawing into the belief of the one, or into the performance of the other; suggesting, as the Gnostics did, that knowledge without practice was enough, and that it was no matter how a man lived, provided his notions of the Gospel were right: he that doeth righteousness, is righteous; not that any man is made righteous by the works of the law, or by his obedience to the law of works, for this is contrary to the express word of God; and besides, the best righteousness of man is imperfect, and can never constitute or denominate him righteous before God; and was he justified by it; it would not only lay a foundation for boasting in him, which ought not to be, but would make the death, the sacrifice, and righteousness of Christ, to be in vain; men are only made righteous by the righteousness of Christ, which be has wrought out which is revealed in the Gospel, and received by faith, and which God imputes without works; so that he that doeth righteousness is he that being convinced of the insufficiency of his own righteousness, and of the excellency and suitableness of Christ's righteousness, renounces his own, and submits to his; who lays hold upon it, receives it, and exercises faith on it, as his justifying righteousness; and, in consequence of this, lives in a course of holiness and righteousness, in opposition to, and distinction from one that commits sin, or lives a sinful course of life; which, though it does not make him righteous in the sight of God, yet it shows him to be righteous in the sight of men, and proves that faith to be right which lays hold on the righteousness of Christ, by which he is truly righteous: even as he is righteous; as Christ himself is righteous; and so the Syriac version reads; not as personal, or as he is personally and essentially righteous as God; but as mystical, every member of his body being clothed with the same robe of righteousness the whole body of Christ is, and indeed justified by the same righteousness that he as Mediator was, when he rose from the dead, as the representative of his people: moreover, as Christ showed himself to be righteous as man, by doing good, so believers in him, by imitating him, and walking as he walked, show themselves to be good and righteous, like, though not equal to him; for as a tree is known by its fruits, so is a good man by his good works, and a righteous man by doing righteousness; and as good fruit does not make a good tree, but shows it to be good, so good works do not make a good man, nor a man's own righteousness make him a righteous man, but show him to be so.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“Let no man deceive you - Either by asserting that "you cannot be saved from sin in this life," or "that sin will do you no harm and cannot alter your state, if you are adopted into the family of God; for sin cannot annul this adoption." Hear God, ye deceivers! He that doeth righteousness is righteous, according to his state, nature, and the extent of his moral powers. Even as he is righteous - Allowing for the disparity that must necessarily exist between that which is bounded, and that which is without limits. As God, in the infinitude of his nature, is righteous; so they, being filled with him, are in their limited nature righteous.”
Source
1871
A.D.
1871
“The same truth stated, with the addition that he who sins is, so far as he sins, "of the devil." let no man deceive you--as Antinomians try to mislead men. righteousness--Greek, "the righteousness," namely, of Christ or God. he that doeth . . . is righteous--Not his doing makes him righteous, but his being righteous (justified by the righteousness of God in Christ, Rom 10:3-10) makes him to do righteousness: an inversion common in familiar language, logical in reality, though not in form, as in Luk 7:47; Joh 8:47. Works do not justify, but the justified man works. We infer from his doing righteousness that he is already righteous (that is, has the true and only principle of doing righteousness, namely, faith), and is therefore born of God (Jo1 3:9); just as we might say, The tree that bears good fruit is a good tree, and has a living root; not that the fruit makes the tree and its root to be good, but it shows that they are so. he--Christ.”
Source

Undated

date unknown
date
unknown
Glossa Ordinaria Medieval
“He who does justice. That is: he who has the act of justice and the intention is indeed just, but not of himself: rather, as that one is, he proceeds from the same root. Justice is in that one principally, in this one secondarily; in that one naturally, in this one through adoption. This very thing, that he who is just is just from him.”
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.