{5} If we say that we have no sin, we {e} deceive ourselves, and the {f} truth is not in us.

(5) There is none but need this benefit, because there is none that is not a sinner.

(e) This fully refutes that perfectness of works of supererogation (doing more than duty requires, the idea that excess good works can form a reserve fund of merit that can be drawn on in favour of sinners) which the papists dream of.

(f) So then, John speaks not thus for modesty's sake, as some say but because it is so indeed.

People's New Testament

1:8 If we say that we have no sin, we deceive ourselves. To say that we have reached a sinless state in which we no longer need the blood of Christ to cleanse us is a deception. This language is in square opposition to the claims of the Perfectionists of all ages.

Wesley's Notes

1:8 If we say - Any child of man, before his blood has cleansed us. We have no sin - To be cleansed from, instead of confessing our sins, 1Jo 1:9, the truth is not in us - Neither in our mouth nor in our heart.

Jamieson-Fausset-Brown Bible Commentary

8. The confession of sins is a necessary consequence of "walking in the light" (1Jo 1:7). "If thou shalt confess thyself a sinner, the truth is in thee; for the truth is itself light. Not yet has thy life become perfectly light, as sins are still in thee, but yet thou hast already begun to be illuminated, because there is in thee confession of sins" [Augustine].

that we have no sin-"Have," not "have had," must refer not to the past sinful life while unconverted, but to the present state wherein believers have sin even still. Observe, "sin" is in the singular; "(confess our) sins" (1Jo 1:9) in the plural. Sin refers to the corruption of the old man still present in us, and the stain created by the actual sins flowing from that old nature in us. To confess our need of cleansing from present sin is essential to "walking in the light"; so far is the presence of some sin incompatible with our in the main "walking in light." But the believer hates, confesses, and longs to be delivered from all sin, which is darkness. "They who defend their sins, will see in the great day whether their sins can defend them."

deceive ourselves-We cannot deceive God; we only make ourselves to err from the right path.

the truth-(1Jo 2:4). True faith. "The truth respecting God's holiness and our sinfulness, which is the very first spark of light in us, has no place in us" [Alford].

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.

Matthew Henry's Whole Bible Commentary

Verses 8-10

Here, I. The apostle, having supposed that even those of this heavenly communion have yet their sin, proceeds here to justify that supposition, and this he does by showing the dreadful consequences of denying it, and that in two particulars:-1. If we say, We have no sin, we deceive ourselves, and the truth is not in us, v. 8. We must beware of deceiving ourselves in denying or excusing our sins. The more we see them the more we shall esteem and value the remedy. If we deny them, the truth is not in us, either the truth that is contrary to such denial (we lie in denying our sin), or the truth of religion, is not in us. The Christian religion is the religion of sinners, of such as have sinned, and in whom sin in some measure still dwells. The Christian life is a life of continued repentance, humiliation for and mortification of sin, of continual faith in, thankfulness for, and love to the Redeemer, and hopeful joyful expectation of a day of glorious redemption, in which the believer shall be fully and finally acquitted, and sin abolished for ever. 2. If we say, We have not sinned, we make him a liar, and his word is not in us, v. 10. The denial of our sin not only deceives ourselves, but reflects dishonour upon God. It challenges his veracity. He has abundantly testified of, and testified against, the sin of the world. And the Lord said in his heart (determined thus with himself), I will not again curse the ground (as he had then lately done) for man's sake; for (or, with the learned bishop Patrick, though) the imagination of man's heart is evil from his youth, Gen. 8:21. But God has given his testimony to the continued sin and sinfulness of the world, by providing a sufficient effectual sacrifice for sin, that will be needed in all ages, and to the continued sinfulness of believers themselves by requiring them continually to confess their sins, and apply themselves by faith to the blood of that sacrifice. And therefore, if we say either that we have not sinned or do not yet sin, the word of God is not in us, neither in our minds, as to the acquaintance we should have with it, nor in our hearts, as to the practical influence it should have upon us.

II. The apostle then instructs the believer in the way to the continued pardon of his sin. Here we have, 1. His duty in order thereto: If we confess our sins, v. 9. Penitent confession and acknowledgment of sin are the believer's business, and the means of his deliverance from his guilt. And, 2. His encouragement thereto, and assurance of the happy issue. This is the veracity, righteousness, and clemency of God, to whom he makes such confession: He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness, v. 9. God is faithful to his covenant and word, wherein he has promised forgiveness to penitent believing confessors. He is just to himself and his glory who has provided such a sacrifice, by which his righteousness is declared in the justification of sinners. He is just to his Son who has not only sent him for such service, but promised to him that those who come through him shall be forgiven on his account. By his knowledge (by the believing apprehension of him) shall my righteous servant justify many, Isa. 53:11. He is clement and gracious also, and so will forgive, to the contrite confessor, all his sins, cleanse him from the guilt of all unrighteousness, and in due time deliver him from the power and practice of it.