It is my understanding that when a person has sinned they are labeled a sinner of that kind. But here we have that it can be said of some people that they used to be that way. This is good news. What do you believe about Christians who used to be sinners?
1 Corinthians 6:9-11 NASB - 9 Or do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived; neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor homosexuals, 10 nor thieves, nor [the] covetous, nor drunkards, nor revilers, nor swindlers, will inherit the kingdom of God. 11 Such were some of you; but you were washed, but you were sanctified, but you were justified in the name of the Lord Jesus Christ and in the Spirit of our God.
He is reminding them that such WERE some of them in contrast to who they now ARE in Christ, despite, obviously, their having returned to their previous BEHAVIOUR.
One is the issue of their New IDENTITY in Christ, the other is the issue of BEHAVIOUR the Believer is no longer to walk in, given his or her New IDENTITY in Christ.
This distinction between who the Believer now IS in Christ, and what his or her BEHAVIOURS are / are not to be, given said New IDENTITY in Christ, is a common theme in Paul's writings.
Notice the two in the following...
Romans 5:6 For when we were yet without strength, in due time Christ died for the ungodly. 5:7 For scarcely for a righteous man will one die: yet peradventure for a good man some would even dare to die. 5:8 But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us. 5:9 Much more then, being now justified by his blood, we shall be saved from wrath through him. 5:10 For if, when we were enemies, we were reconciled to God by the death of his Son, much more, being reconciled, we shall be saved by his life.
That is now the New Identity, that the following is based on...
Romans 12:1 I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service. 12:2 And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God. For I say, through the grace given unto me, to every man that is among you, not to think of himself more highly than he ought to think; but to think soberly, according as God hath dealt to every man the measure of faith.
Here it is again - his call for Behaviour in line with the New Identity...
Philippians 1:27 Only let your conversation be as it becometh the gospel of Christ: that whether I come and see you, or else be absent, I may hear of your affairs, that ye stand fast in one spirit, with one mind striving together for the faith of the gospel;
Conversation: Early Modern English word for "manner of life."
And so on...
Because Romans 5:6-8, in each...our stead.