"If we say we are in fellowship with Him, while we walk in darkness, we lie instead of being in truth. But if we walk in the light, as He is in the light, we are in fellowship with one another, and the blood of Jesus, the Son of God, purifies us from all sin. If we say, "We have no sin," we deceive ourselves and the truth is not in us. If we confess our sins, He who is faithful and just will forgive us our sins and cleanse us from all wickedness." (1 John 1:6-9)
If we decide for God, we cannot continue to surrender to sin. Obviously, no one is without sin; we all need the salvation of Christ; but forgiveness itself compels us even more to stay away from sin. We are invited to confess our sins in the sacrament of penance, to humbly admit our wrongdoings, to open our hearts to the love and mercy of God. To confess is to say, "I choose to live for You, Lord. I want to be like You. I cannot do it on my own."