I agree that in this form we will never be completed in sanctification. But I'm curious what your response would be to the following?
16So I say, walk by the Spirit, and you will not gratify the desires of the flesh.
17For the flesh craves what is contrary to the Spirit, and the Spirit what is contrary to the flesh. They are opposed to each other, so that you do not do what you want.
18But if you are led by the Spirit, you are not under the law.
19The acts of the flesh are obvious: sexual immorality, impurity, and debauchery;
20idolatry and sorcery; hatred, discord, jealousy, and rage; rivalries, divisions, factions,
21and envy; drunkenness, orgies, and the like. I warn you, as I did before, that those who practice such things will not inherit the kingdom of God.
22But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness,
23gentleness, and self-control. Against such things there is no law.
24Those who belong to Christ Jesus have crucified the flesh with its passions and desires.
25Since we live by the Spirit, let us walk in step with the Spirit.
Do you think that a person can begin to walk by the Spirit, then turn from that back to their former life and still inherit God's Kingdom if they continue on in an unrepentant lifestyle?