A Study of Colossians 1:20
“And, having made peace through the blood of his cross, by him to reconcile all things unto himself; by him, [I say], whether [they be] things in earth, or things in heaven.”
Christ established peace between God and sinners when He died on the cross to put away the sins of His people. This is why He is called the Prince of peace (Isaiah 9:6).
He accomplished this peace as He was “made sin for us” and as we were made the “righteousness of God in HIM” (2 Corinthians 5:21).
God the Father imputed our sins to Christ who became legally and truly responsible for them. Our sins became His sins, not by any infusion, impartation, or contamination of either of His natures (Divine and human), but by imputation alone. This is why Christ suffered in His very soul under wrath of His Holy Father. When He paid the debt of our sins in full and established righteousness for us, the ground of peace was established. Our peace with God is by the redemptive work of Christ, His shed blood and imputed righteousness alone.
God the Holy Spirit establishes THIS peace within our hearts in the new birth as He points us to Christ and Him crucified as the only ground of our peace with God. This brings peace of conscience whereby we who are sinners find relief, forgiveness, and peace with God, and by which we draw near unto God with confidence in Christ (Hebrews 10:19-22). Any notions or feelings of peace outside of Christ and Him crucified are false and deadly.