"Create in me a clean heart, O God,
And renew a steadfast spirit within me."
God is gracious to forgive us and set us aright when we confess our sins to Him. Pride may keep us from acknowledging our sin for a season, but if we truly belong to the Lord we won't be able to continue in sin. The Holy Spirit will convict us and bring us to repentance. In our own strength we cannot make our hearts clean and restore ourselves to a right relationship with God. This is work that only He can do. When we try to accomplish this on our own, we set ourselves up for failure. Complete reliance upon God is crucial.