21 For you have been called for this purpose, since Christ also suffered for you, leaving you an example for you to follow in His steps, 22 who committed no sin, nor was any deceit found in His mouth; 23 and while being reviled, He did not revile in return; while suffering, He uttered no threats, but kept entrusting Himself to Him who judges righteously; 24 and He Himself bore our sins in His body on the cross, so that we might die to sin and live to righteousness; for by His wounds you were healed. 25 For you were continually straying like sheep, but now you have returned to the Shepherd and Guardian of your souls. 1 Peter 2:21-25 NASB
The Lord gave the Church a wonderful gift when He knocked Saul of Tarsus off his horse and effectually called Him to be His Apostle. His Epistle to the Romans is a huge piece of the doctrinal foundation of the Church. In Romans 3:20-5:21 he covered the doctrine of justification. This is God’s declaring the believing sinner righteous. In Romans 6:1-8:39 he covers the practical ramifications of this justification. This is the doctrine of sanctification, which is God’s producing actual righteousness in the believer. Many take missteps in their theology by confusing these two aspects of our salvation. Justification is a legal term referring to a judge declaring a person charged with a crime to be not guilty. When a sinner believes the Gospel by God’s grace through faith, He justifies them. This is His monergistic work, His alone. On the other hand, sanctification is the synergistic work of God and the believer in “working out the believer’s salvation with fear and trembling.” This is the work of transforming the believer into one who bears Christ’s very character.