1 Peter 2:22-25

He committed no sin nor was deceit found in his mouth.  When he was maligned, he did not answer back; when he suffered, he threatened no retaliation, but committed himself to God who judges justly.  He himself bore our sins in his body on the tree, that we may cease from sinning and live for righteousness. By his wounds you were healed.  For you were going astray like sheep but now you have turned back to the shepherd and guardian of your souls.

Jesus died to free us from sin so that we can now live for righteousness. We are healed because Jesus suffered and died on the cross. He had the courage to trust Himself to His Father in Heaven when it came time to hang on the cross. At any moment throughout the road to the cross, Jesus could have stopped it all. All authority in heaven and on earth was given to Jesus Christ, Son of God and son of man, and He chose to die showing complete trust in His Father, and unparalleled love for all sinners who are in desperate need of a Savior. We are lost sheep without Jesus. God's call to return to Himself and repent has come through His one and only Son.