Confession prepares the way for forgiveness. It's in the Bible, I John 1:9, NIV. "If we confess our sins, He is faithful and just and will forgive us our sins and purify us from all unrighteousness."
Confession prepares the way for worship. It's in the Bible, Nehemiah 9:3, NIV. "[The Israelites] stood where they were and read from the Book of the Law of the Lord their God for a quarter of the day, and spent another quarter in confession and in worshipping the Lord their God."
Confession prepares the way for reconciliation and fellowship. It's in the Bible, James 5:16, NIV. "Therefore confess your sins to each other and pray for each other so that you may be healed. The prayer of a righteous man is powerful and effective."
Confession makes success possible. It's in the Bible, Proverbs 28:13, TLB. "A man who refuses to admit his mistakes can never be successful. But if he confesses and forsakes them, he gets another chance."