Past our FIRST BELIEF on Jesus Christ, of course. When else could it be talking about? Are you letting men's leaven doctrines speak through your mind, or can you simply read that Scripture as written?
Paul is talking about FUTURE SINS we may have. And don't tell me you don't slip up at times and commit sin, for you'd be telling a lie, just like Apostle John showed also in 1 John 1.
@marks is right.
And let me give you something to think about.
If you are born agin........not just water baptized and religious, trying to be like Christ.......so, none of that JUNK.
Im talking about God giving you the NEW BIRTH...
So, if you have that, then consider that on the day that God saved you....>He KNEW of everything you would think or do, from that "Cross day", till the day you DIE.
He knows it all......so, He would know of all your works of the flesh you will do, later on.
Notice.......God knew of all this future behavior, some of it very ungodly, and He still saved you that day., knowing what you would do later.
See that?
So, why would God save you, if you could "out sin" Salvation, later?
A.) You cant, as the Blood of Jesus, is always greater than your sin. "Where sin abounds, GRACE MORE ABOUNDS"......and furthermore, Jesus has all your sin,
and died for them ALL = 2000 yrs ago.
So, now being made free from sin, you are to live in this understanding, and this will not lead you to sin (using a license as the deceivers like to RANT), but this freedom will lead you to a perfected discipleship and cause you to love God more.
See, its not by trying to be good that we are good. Its by understanding who we are become as a new creation, in Christ, that is our power to live the holy life.