“If we say, ‘We have no sin,’ we deceive ourselves.” (1 John 1: 8) On the other hand, if we recognize our sin, and confess it as existing, as undesirable, as unworthy of our relationship with Christ; then God the Father is willing and able to forgive us.
Jesus presents us as His clean brothers and sisters to His Father — we are washed in the blood of Christ so that “though [our] sins are like scarlet, they are as white as snow; though they are as red as crimson, they are like wool.” (Isaiah 1: 18)
Jesus says this is reasonable; that we are able to discuss this truth — “if [we] are willing and obedient, [we] eat the good things of the land.” (Isaiah 1: 19) Our obedience consists of believing on Christ, of recognizing our core unworthiness, of placing our entire trust in His sacrificial grace and in His righteousness.
Paul rhetorically asks, “What should we say then? Should we continue in sin so that grace might multiply? Absolutely not!” (Romans 6: 1 – 2) We are not to sin, but “if anyone does sin, we have an advocate with the Father — Jesus Christ the Righteous One. He Himself is the propitiation for our sins, and not only for ours, but also for those of the whole world.” (1 John 2: 1 – 2)