What does Romans 12:1 mean?
A new section of Paul's letter begins with Romans 12. He has concluded the section dealing with the doctrine of salvation and what it means to come to God through faith in Christ. Now he begins to describe how those of us who are in Christ should live. How should we respond to God's great mercy to us?Paul launches into an appeal to his spiritual siblings: his brothers and sisters in Christ. Though he is the apostle sent by Jesus Himself to take the gospel to the world, Paul is also "one of us." He is a sinful human being saved by the grace of God through faith in Jesus. He calls God Father, as we do, making him our brother.
Paul urges us to recognize that God has shown us enormous mercy, described in detail earlier in this letter. The hymn in the previous four verses made it clear that God owes us nothing. Instead of death, though, He has given us life and purpose in Christ. He has forgiven our sins and shared with us the riches of His glory. We deserved none of that. How should we respond?
Paul writes that as the Jewish people offered killed animals as sacrifices to God, Christian should instead offer ourselves, our bodies, to Him as living sacrifices. In other words, the only rational response to God's mercy in giving us eternal life is to give Him our lives as a sacrifice to use for His purposes right now.
Animal sacrifices under the old covenant sacrificial system had to be set apart from the herd for that purpose and chosen with care to make sure they were acceptable—unmarked and unharmed. As living sacrifices, God has already set us apart for His purposes and declared us acceptable because He sees us in our position in Christ. In other words, we do not have to wait to be better people before we offer our bodies and lives to God. As people in Christ, He will receive the sacrifice of our everyday lives right now.
This life of worship, then, is the appropriate response to the mercy God has already given to us.