{7} If we say that we have not sinned, we make him {i} a liar, and his {k} word is not in us.

(7) A repeat of the former verse, in which he condemned all of sin without exception: so much so that if any man persuade himself otherwise, he does as much as in him lies, make the word of God himself useless and to no effect, yes, he makes God a liar: for to why in times past did we need sacrifices, or now Christ and the gospel, if we are not sinners?

(i) They do not only deceive themselves but are blasphemous against God.

(k) His doctrine shall have no place in us; that is, in our hearts.

People's New Testament

1:10 If we say that we have not sinned. God says we have sinned. He declares There is none righteous; no, not one. See Ro 3:10 Ps 14:4.

We make him a liar. Hence, if we affirm that we are sinless, we make God a liar.

NOTE.--It must be noted that these words concerning sin, found in 1Jo 1:8-10, are not addressed to Gentile sinners, but a generation which had grown up in the church. Indeed, of all the epistles, this is the only one which can truly be said to have been addressed to a Christian generation. Hence, it would naturally emphasize, not the unconverted sinner's need of pardon, but of the Christian's constant need of a pardoning Savior. It is the Christian who cannot say that he has no sin, and who must find pardon by confessing his sins to Christ (Ac 2:38) shows how the alien sinner may obtain remission (1Jo 1:9); shows how the Christian, when he sins, may obtain remission.

Wesley's Notes

1:10 Yet still we are to retain, even to our lives' end, a deep sense of our past sins. Still if we say, we have not sinned, we make him a liar - Who saith, all have sinned. And his word is not in us - We do not receive it; we give it no place in our hearts.

Jamieson-Fausset-Brown Bible Commentary

10. Parallel to 1Jo 1:8.

we have not sinned-referring to the commission of actual sins, even after regeneration and conversion; whereas in 1Jo 1:8, "we have no sin," refers to the present GUILT remaining (until cleansed) from the actual sins committed, and to the SIN of our corrupt old nature still adhering to us. The perfect "have . sinned" brings down the commission of sins to the present time, not merely sins committed before, but since, conversion.

we make him a liar-a gradation; 1Jo 1:6, "we lie"; 1Jo 1:8, "we deceive ourselves"; worst of all, "we make Him a liar," by denying His word that all men are sinners (compare 1Jo 5:10).

his word is not in us-"His word," which is "the truth" (1Jo 1:8), accuses us truly; by denying it we drive it from our hearts (compare Joh 5:38). Our rejection of "His word" in respect to our being sinners, implies as the consequence our rejection of His word and will revealed in the law and Gospel as a whole; for these throughout rest on the fact that we have sinned, and have sin.

Matthew Henry's Concise Commentary

1:5-10 A message from the Lord Jesus, the Word of life, the eternal Word, we should all gladly receive. The great God should be represented to this dark world, as pure and perfect light. As this is the nature of God, his doctrines and precepts must be such. And as his perfect happiness cannot be separated from his perfect holiness, so our happiness will be in proportion to our being made holy. To walk in darkness, is to live and act against religion. God holds no heavenly fellowship or intercourse with unholy souls. There is no truth in their profession; their practice shows its folly and falsehood. The eternal Life, the eternal Son, put on flesh and blood, and died to wash us from our sins in his own blood, and procures for us the sacred influences by which sin is to be subdued more and more, till it is quite done away. While the necessity of a holy walk is insisted upon, as the effect and evidence of the knowledge of God in Christ Jesus, the opposite error of self-righteous pride is guarded against with equal care. All who walk near to God, in holiness and righteousness, are sensible that their best days and duties are mixed with sin. God has given testimony to the sinfulness of the world, by providing a sufficient, effectual Sacrifice for sin, needed in all ages; and the sinfulness of believers themselves is shown, by requiring them continually to confess their sins, and to apply by faith to the blood of that Sacrifice. Let us plead guilty before God, be humble, and willing to know the worst of our case. Let us honestly confess all our sins in their full extent, relying wholly on his mercy and truth through the righteousness of Christ, for a free and full forgiveness, and our deliverance from the power and practice of sin.