How do we know that true repentance is sincere?

True repentance is marked by a deep awareness of one's sinfulness and a sincere desire to turn back to God. In Psalm 51:3-5, David expresses his recognition of transgressions and acknowledges, 'I have sinned against the Lord,' reflecting a genuine brokenness over his actions. This acknowledgment signifies that he understands the seriousness of his offense against God. The depth of his sin—acknowledging both sins of omission and commission—demonstrates a contrite heart that seeks forgiveness. Such genuine repentance is the work of the Holy Spirit, leading one away from pride and towards humility before God.