13 Then David said to Nathan, "I have sinned against the Lord." Nathan replied, "The Lord has taken away your sin. You are not going to die.
5 Then I acknowledged my sin to you and did not cover up my iniquity. I said, "I will confess my transgressions to the Lord." And you forgave the guilt of my sin.
(Read Psalm 32:3-7)
It is very difficult to bring sinful man humbly to accept free mercy, with a full confession of his sins and self-condemnation. But the true and only way to peace of conscience, is, to confess our sins, that they may be forgiven; to declare them that we may be justified. Although repentance and confession do not merit the pardon of transgression, they are needful to the real enjoyment of forgiving mercy. And what tongue can tell the happiness of that hour, when the soul, oppressed by sin, is enabled freely to pour forth its sorrows before God, and to take hold of his covenanted mercy in Christ Jesus! Those that would speed in prayer, must seek the Lord, when, by his providence, he calls them to seek him, and, by his Spirit, stirs them up to seek him. In a time of finding, when the heart is softened with grief, and burdened with guilt; when all human refuge fails; when no rest can be found to the troubled mind, then it is that God applies the healing balm by his Spirit.
9 If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness.
(Read 1 John 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 Commentary on 2 Samuel 12:13
Commentary on 2 Samuel 12:1-14
(Read 2 Samuel 12:1-14)
God will not suffer his people to lie still in sin. By this parable Nathan drew from David a sentence against himself. Great need there is of prudence in giving reproofs. In his application, he was faithful. He says in plain terms, Thou art the man. God shows how much he hates sin, even in his own people; and wherever he finds it, he will not let it go unpunished. David says not a word to excuse himself or make light of his sin, but freely owns it. When David said, I have sinned, and Nathan perceived that he was a true penitent, he assured him his sin was forgiven. Thou shalt not die: that is, not die eternally, nor be for ever put away from God, as thou wouldest have been, if thou hadst not put away the sin. Though thou shalt all thy days be chastened of the Lord, yet thou shalt not be condemned with the world. There is this great evil in the sins of those who profess religion and relation to God, that they furnish the enemies of God and religion with matter for reproach and blasphemy. And it appears from David's case, that even where pardon is obtained, the Lord will visit the transgression of his people with the rod, and their iniquity with stripes. For one momentary gratification of a vile lust, David had to endure many days and years of extreme distress.