Some things to think about. Please bear with me as I am going to post the context.
1Jo 1:3 That which we have seen and heard declare we unto you, that ye also may have fellowship with us: and truly our fellowship is with the Father, and with his Son Jesus Christ. 4 And these things write we unto you, that your joy may be full. 5 This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all. 6 If we say that we have fellowship with him, and walk in darkness, we lie, and do not the truth: 7 But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin. 8 If we say that we have no sin, we deceive ourselves, and the truth is not in us. 9 If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness. 10 If we say that we have not sinned, we make him a liar, and his word is not in us.
Now I have done a study on this topic which I will type up on to here maybe tomorrow. But I'd like to point out a couple things just in short and maybe ask a couple more questions today in the time I have.
While I disagree with GustheMule, that confession is a great thing to do for sancification (rather to go and sin no more would be desirable for sanctification), I do agree with him on the intent of the author.
It's not merely that I am talking sides or have some preconcieved notions I'm bring to the text. Such a doctrine I would not throw out so easily except it is readily verifiable in the scriptures.
We see in this context John is making contrasts. The contrast between light and darkness. Truth and lie. Fellowship or out of fellowship.
We know no Christian is in darkness. No Christian is of a lie. No Christian could be Christ's without being in fellowship with Him.
Some may have said they had fellowship with Him but walked in darkness. John said they are liars and do not the truth. Some may say they have no sin? This is yet another verse that leads me to believe it is pertaining to salvation. Christ didn't come to call the righteous but the sinners to repentance. If you say you have no sin, you have no part with Christ. Rather you have made your own way into heaven without any need for imputed righteousness. But anyone that has come to Christ has gone through the godly sorrow leading to repentance for salvation not to be repented of. So I would ask, could you be a Christian and say you have no sin? Impossible, then what need is there for Christ? The law is perfect in converting the soul. You have no need for the school master of the law if you have no sin. But all Christians have realized that they have sinned and altogether come short of the glory of God.
Now if we don't say we have no sin, but rather confess we are sinners He is faithful and just to forgive us our sins. If we say we have no sin, we make Him a liar and the truth is not in us. Would a Christian make Christ a lie and have no truth in him? Rather would a Christian by John's definition do sucha thing?
If the purpose for what John wrote here in 1:9 was confession of on-going sins, then when he restated if we have no sin the truth is not in us; he should have also restated we need to confess our sins. But what does he say?
1Jo 2:1 My little children, these things write I unto you, that ye sin not. And if any man sin, we have an advocate with the Father, Jesus Christ the righteous:
Here he missed a golden opportunity to make sure he got his point across about confession. But rather he tells us we ought go and sin no more. Then if we do sin, have no fear we have an advocate. Rather than if we sin confess it to our advocate.
Something to think about. If you die with an unconfessed sin will you go to heaven or hell? If you die with an unconfessed sin, that you had opportunity for confess where would you go? Is your salvation sure and full when you have faith in Christ, or is it dependant on your work of keeping short accounts? 1:9 says if we confess our sins He is faithful and just to forgive us our sins. What sins were covered in the blood when Christ died upon the cross? Past, Present, Future, None of the Above, or All of the Above.
Just some thoughts. I post a good little (not-so-little) study on it tomorrow.