Hebrews 12:5-11

And have you forgotten the exhortation that addresses you as sons?

“My son, do not regard lightly the discipline of the Lord,
    nor be weary when reproved by him.
For the Lord disciplines the one he loves,
    and chastises every son whom he receives.”

It is for discipline that you have to endure. God is treating you as sons. For what son is there whom his father does not discipline? If you are left without discipline, in which all have participated, then you are illegitimate children and not sons. Besides this, we have had earthly fathers who disciplined us and we respected them. Shall we not much more be subject to the Father of spirits and live? For they disciplined us for a short time as it seemed best to them, but he disciplines us for our good, that we may share his holiness. For the moment all discipline seems painful rather than pleasant, but later it yields the peaceful fruit of righteousness to those who have been trained by it.

Philippians 2:12-13

Therefore, my beloved, as you have always obeyed, so now, not only as in my presence but much more in my absence, work out your own salvation with fear and trembling, for it is God who works in you, both to will and to work for his good pleasure.

Question: Why must believers keep killing sin, and how do we know the fight ends in life?

Answer: Because we owe the flesh nothing; the Holy Spirit lives in us to put sin to death—and His leading proves we are God’s adopted children, heirs of eternal life.

Romans 8:14
“For all who are led by the Spirit of God are sons of God.”