I think the issue here is pre and post rebirth, what I mean is; before we become Christians we are all guilty of various sins, When we accept Jesus as our Lord, He saves us and forgives all our sins past present and future. Our Spirit is resurrected from the dead (another issue I know) and we start our life as a Christian.We have been Justified in Christ ACTS 13:39 once and for all .What then begins is our Sanctification, 1 Cor 1:30 says Christ is our sanctification, as we grow in Christ we grow in our sanctification. Now this is where we find we are not condemned (Rom 8:1) But we must work out our own salvation through fear and trembling (Phil 2:12) We are saved but must work at becoming more like Christ. A work so difficult we cannot do it without the Holy Spirit working in us.So, my point, if you sin after you are saved (we all do this) then we must deal with it and I have found no better way than going to the person I have sinned against and confessing / apologising / repaying, then the next time Satan tempts you you think 'I've been there and got disciplined for it, I am not going there again'. It is a hard lesson and may be my stubbornness means it's the only way God can break me, for others there may be other ways.If we don't deal with sin (even forgiven sin) then we often fall to temptation with the thought 'I can always get forgiven again' which is true but it stops us getting closer to God.I know this is deep and may be I have not made myself clear, the last thing I want is to confuse people, if you ask I can give you Bible refs and studies on this subjects (too much to copy here) which would give more detail