Calvin on the Active Obedience of Christ
"Now someone asks, How has Christ abolished sin, banished the separation between us and God, and acquired righteousness to render God favorable and kindly toward us? To this we can in general reply that he has achieved this for us by the whole course of his obedience. This is proved by Paul’s testimony: “As by one man’s disobedience many were made sinners, so by one man’s obedience we are made righteous” [Romans 5:19]. In another passage, to be sure, Paul extends the basis of the pardon that frees us from the curse of the law to the whole life of Christ: “But when the fullness of time came, God sent forth his Son, born of woman, subject to the law, to redeem those who were under the law” [Galatians 4:4-5]. Thus in his very baptism, also, he asserted that he fulfilled a part of righteousness in obediently carrying out his Father’s commandment [Matthew 3:15]. In short, from the time when he took on the form of a servant, he began to pay the price of liberation in order to redeem us.