Just some comments on the above question and a few others that relate directly to it, such as "Christ has already forgiven all of our sins, past, present and future".
There seems to be a continual thread of assumption in those that hold to some form of eternal security that Christ has forgiven sins. I'm going to assume that it is related to the Atonement, and by virtue of Christ dying upon the Cross forgave man's sins.
First, Christ forgave no man his sins. Not one single sin was forgiven on the Cross. The Cross made the forgiveness of sins possible ONLY because Christ propitiated those sins, the penalty of those sins. If that were actually true, then all of mankind is automatically spiritually saved. That is a whole new form of Universalism.
There is absolutely no forgiveness without repentance. It is stated this way all through the NT. Even in the OT. We have an obligation as believers to be reconciled to God. II Cor 5:20 Also Matt 5:24 relates to the Lord's Prayer and also the unfaithful servant. God holds us accountable also for those who wrong us. We are to forgiven them. We are to forgive them seventy times seven. There is no end to the forgiveness. As we forgive those who treaspass against us, so He will forgive our trespasses.
We MUST keep sin out of our lives. We must work to remain in Him and when we sin, we must seek forgiveness of those sins. Sin separates man from God. That is why daily confession is an absolute must in the life of a believer. There is no such thing as automatic forgiveness. No forgiveness without repentance/confession.
Another area is that of the long list of evildoers who will not enter into heaven. Some assume that believers cannot fall or resort to this kind of evil. The problem with evil is that it starts small, not very beguiling in order to begin to get a beleiver to slip and slide and work him over to the precipice. When a believer begins to rationalize, to make excuses he is well on the way to overt, willingly sinning and just simply overlooking it. This is probably the greatest danger to the view of OSAS. We become hardened to sin. We assume that we are automatically forgiven because we at one time believed. Yet, sin, moves one outside of being IN Christ.
At other places in this thread, comments questioning just how many sins does it take to fall from salvation. The answer is ONE. See the Story of Adam. A believer possesses a fallen human nature, will sin, he must make sure he is aware, even confess sin without knowledge, to make sure that He remains reconciled to God.
This is the anquish of Paul in Rom 7:13-25.
That is the reason for repenting.
I definately agree with you about repentance..i should have made that clear. We cannot access that forgiveness unless we have repented...but once we have repented, we are completely forgiven for our sins. May i add that true repentance is completely turning from that sin and going the opposite direction. Once we submit our lives to God, we no longer want to do the things we used to. Sure, we still sin, but we also keep repenting and getting back up. No one can live a life without any sin at all. Even Apostle Paul talked about that in Romans. We will always struggle with the desires of the flesh. It is what we do with those desires.