Growing up you always hear the scripture that if we confess our sins He is faithful and just to forgive our sins and cleanse us from all unrighteousness. I can quote it like a poem I memorized in Mrs. Kennedy's 12th Grade English Class. But there's so much more happening here.

1 John 1:9 KJV
"If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness."

Confession isn't a general prayer of "God forgive me for my sins" as I have done most of my life. Confession in this is specific repentance of a sin in front of an audience even if your audience is only one. Confession is a 2-part process- 1. Specified prayer for forgiveness of sin 2. Claiming the salvation and cleansing of Christ. Both steps are essential. One without the other leaves the work that God offers incomplete. 

There a reason that God wants us to confess our sins out-loud. Confession brings an awareness of our sin that opens our eyes to how much we have been forgiven of and those who have been forgiven much love much. 

Luke 7:47 KJV
"Wherefore I say unto thee, Her sins, which are many, are forgiven; for she loved much: but to whom little is forgiven, the same loveth little."

Even through our sin all He's trying to do is win our hearts.

Confession is a proclamation to the spiritual realm that you are running back to Christ as well. There's no better way to defeat the works of the evil one than to proclaim out-loud that he has no place, no grip, not even a foothold in or on your heart. He cant hear your prayers when they are only prayed in your head. Confession puts the devil in his place, under the heel of Christ. And your heart back where it belongs, under the influence of Christ.

There's more to be had here... 

Deuteronomy 10:16-18
"16 Circumcise your hearts, therefore, and do not be stiff-necked any longer. 17 For the Lord your God is God of gods and Lord of lords, the great God, mighty and awesome, who shows no partiality and accepts no bribes. 18He defends the cause of the fatherless and the widow, and loves the alien, giving him food and clothing."

Confession is a circumcising of the heart. Its an uncomfortable cutting away of the flesh to prevent disease and to allow healing to move in. That healing is Christ. There is no other way. 

And so confession gives way to not only a deeper love and understanding of the Lord and His ways, but more importantly confession brings healing.