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I have a question, when you say we receive "power over sin" how do you see this?
1. Are you saying that a person is given the power to not sin in the flesh?
2. Or are you saying that our power over sins of the flesh is the shed blood of Jesus on the cross that has already paid for our sins of the flesh?
If Number 1 then why do those in Christ still sin in the flesh?
Evidently you have been taught that we are still the same after believing in Christ, just forgiven while we keep on sinning. That is a false doctrine that became very popular during the Reformation, and is still popular to those who are in the Church, but are not of it. To them Jesus will say, "I never knew you, you workers of lawlessness."
Few there are who find it. You must be born again, which means we are given the Holy Spirit. And to receive Him the first thing you must do is REPENT. Repent from your sin nature. Want to become clean and to become like Christ. If that is not your desire, and you love darkness over light, then that is the way you will remain. The power that Christ gives us over sin is His gift to us. It is then Him working righteousness through us.
Romans 6:2 we are dead to sin.
Romans 8:2 the law of the Spirit of life in Christ has freed me from the law of sin and death.
Romans 8:9 you are NOT IN THE FLESH but in the Spirit, if the Spirit of God indwells you.
1 John 3 study carefully. If you are still sinning you are of the devil and still lost.
If you need help in this, let me send you my testimony. I was in the church for nearly 30 years before becoming saved. I'm afraid, there are many in the church just like I was.