All of the following is talking about eternal life vs. eternal death.
3 times in these 8 verses, Paul warns that sin results in eternal death.
Must he tell these believers that unbelievers who sin are going to hell?
No, of course not ... they already know that, don't they!
Obviously, Paul is warning these believers about the end result of their sinning!
And, IMO, he is talking about habitual unrepentant sinning,
Romans 6:
16 Do you not know that to whom you present yourselves slaves to obey,
you are that one’s slaves whom you obey, whether of sin leading to death,
or of obedience leading to righteousness?
17 But God be thanked that though you were slaves of sin,
yet you obeyed from the heart that form of doctrine to which you were delivered.
18 And having been set free from sin, you became slaves of righteousness.
19 I speak in human terms because of the weakness of your flesh.
For just as you presented your members as slaves of uncleanness,
and of lawlessness leading to more lawlessness,
so now present your members as slaves of righteousness for holiness.
20 For when you were slaves of sin, you were free in regard to righteousness.
21 What fruit did you have then in the things of which you are now ashamed?
For the end of those things is death.
22 But now having been set free from sin, and having become slaves of God,
you have your fruit to holiness, and the end, everlasting life.
23 For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord.
We need to understand Paul's writing style (but who does?).
E.G. He is joking when he says they are slaves of God.
They are called to be such, but at the moment they are into habitual sinning.
And Paul is back, basically repeating the same warning ...
Romans 8:
13 For if you live according to the flesh you will die;
but if by the Spirit you put to death the deeds of the body, you will live.
14 For as many as are led by the Spirit of God, these are sons of God.
