If anyone is in Christ, he is a new creation; the old has gone, the new has come! All this is from God, who reconciled us to himself through Christ and gave us the ministry of reconciliation: that God was reconciling the world to Himself in Christ, not counting men's sins against them. And He has committed to us the message of reconciliation.
This is what it's written: The Christ will suffer and rise from the dead on the third day, and repentance and forgiveness of sins will be preached in His name to all nations.
Some took it as foregone of law to be preached.
To understand the meaning of "the strength of sin is the law" one should read "What shall we say, then? Is the law sinful? Certainly not! What shall we say, then? Is the law sinful? Certainly not! Nevertheless, I would not have known what sin was had it not been for the law. For I would not have known what coveting really was if the law had not said, “You shall not covet.”But sin, seizing the opportunity afforded by the commandment, produced in me every kind of coveting. For apart from the law, sin was dead. Once I was alive apart from the law; but when the commandment came, sin sprang to life and I died. I found that the very commandment that was intended to bring life actually brought death. For sin, seizing the opportunity afforded by the commandment, deceived me, and through the commandment put me to death. So then, the law is holy, and the commandment is holy, righteous and good."