Verse 3. - Such being our hope, based upon God's promises ἐπ αὐτῷ, of becoming like him, we must keep this prospect ever in view, and live up to it. Commentators differ as to whether αὐτῷ refers to the Father or Christ, and so also with regard to ἐκεῖνος. The best way is to take αὐτῷ as God, and ἐκεῖνος as Christ: this agrees with αὐτόν in verse 2, with ἐκεῖνος in verse 5, and with the common use of the two pronouns. It is doubtless possible, especially in St. John, to take ἀκεῖνος as merely recalling the person already indicated by αὐτός or otherwise, and make both pronouns here refer to God. At first sight this seems to make a better sequence between verses 2 and 3: hereafter we shall be like God; therefore here we must strive to become pure as he is. Moreover, it is of the Father that it is written, "Be ye holy; for I am holy" (Leviticus 11:44; 1 Peter 1:15, 16); and again, "Ye shall be perfect, as your heavenly Father is perfect" (Matthew 5:48). But the other is simpler grammatically, and preserves the logical sequence equally well. Hereafter we shall be like God. Every one who has such a hope as this will aim at becoming like God here; even as Jesus Christ has set us an example, a perfect realization of human conformity to God.

3:3-10 The sons of God know that their Lord is of purer eyes than to allow any thing unholy and impure to dwell with him. It is the hope of hypocrites, not of the sons of God, that makes allowance for gratifying impure desires and lusts. May we be followers of him as his dear children, thus show our sense of his unspeakable mercy, and express that obedient, grateful, humble mind which becomes us. Sin is the rejecting the Divine law. In him, that is, in Christ, was no sin. All the sinless weaknesses that were consequences of the fall, he took; that is, all those infirmities of mind or body which subject man to suffering, and expose him to temptation. But our moral infirmities, our proneness to sin, he had not. He that abides in Christ, continues not in the practice of sin. Renouncing sin is the great proof of spiritual union with, continuance in, and saving knowledge of the Lord Christ. Beware of self-deceit. He that doeth righteousness is righteous, and to be a follower of Christ, shows an interest by faith in his obedience and sufferings. But a man cannot act like the devil, and at the same time be a disciple of Christ Jesus. Let us not serve or indulge what the Son of God came to destroy. To be born of God is to be inwardly renewed by the power of the Spirit of God. Renewing grace is an abiding principle. Religion is not an art, a matter of dexterity and skill, but a new nature. And the regenerate person cannot sin as he did before he was born of God, and as others do who are not born again. There is that light in his mind, which shows him the evil and malignity of sin. There is that bias upon his heart, which disposes him to loathe and hate sin. There is the spiritual principle that opposes sinful acts. And there is repentance for sin, if committed. It goes against him to sin with forethought. The children of God and the children of the devil have their distinct characters. The seed of the serpent are known by neglect of religion, and by their hating real Christians. He only is righteous before God, as a justified believer, who is taught and disposed to righteousness by the Holy Spirit. In this the children of God are manifest, and the children of the devil. May all professors of the gospel lay these truths to heart, and try themselves by them.And every man that hath this hope in him,.... Or on him, Jesus Christ; for a true hope of that eternal happiness, which lies in likeness to Christ, and in the vision of him, is only founded on his person, blood, righteousness, and sacrifice: and this hope every man has not, only he who is born again; for this grace is implanted in regeneration, when men are of abundant mercy begotten unto it, and have it bestowed upon them as a free grace gift; and which is of great service to them both in life and in death; and among the rest it has this influence and effect upon them, that every such person that has it,

purifieth himself even as he is pure; not that any man can purify or cleanse himself from sin, this is only owing to the grace of God and blood of Christ; nor that any man can be so pure and holy as Christ is, who is free from all sin, both original and actual; but this must be understood either of a man that has faith and hope in Christ, dealing by these with the blood of Christ for purity and cleansing, with whom and which these graces are conversant for such purposes; or of such a person's imitating of Christ in the holiness of his life and conversation, making him his pattern and example, studying to walk as he walked; to which he is the more excited and stimulated by the hope he has of being a Son of God, a dear child of his, and therefore ought to be a follower of him, and walk as Christ walked, in humility; love, patience, and in other acts of holiness; and by the hope he has of being like unto him, and with him in the other world to all eternity: but then this "as" is only expressive of some degree of likeness and similitude, and not perfect equality, which is not to be expected in this, or in the world to come; believers indeed, who have faith and hope in the justifying righteousness of Christ, may, and should consider themselves pure and righteous, and free from sin, as Christ is; being clothed upon with his robe of righteousness, in which they stand without fault before the throne, without spot or wrinkle, or any such thing; but this does not seem to be the sense of the place here, the argument being to engage the saints to purity and holiness of life and conversation, from the consideration of the great love of God bestowed upon them in their adoption, and from their hope of eternal happiness, as the context shows; see 2 Corinthians 7:1; other arguments follow.