How do we know that confession of sin is necessary for salvation?

The necessity of confessing sin is grounded in several biblical passages that emphasize the importance of acknowledging our transgressions before God. For example, Psalm 51 illustrates David's heartfelt acknowledgment of his sin against God, wherein he pleads for mercy and cleansing. In 1 John 1:9, we are assured that if we confess our sins, God is faithful and just to forgive us. This confession is not merely a ritual but an expression of true repentance, which is wrought by the Holy Spirit. Without recognizing our sinfulness and our need for Christ, we cannot fully grasp the grace offered to us through His sacrifice, which alone provides the righteousness necessary for salvation.