The Bible says: “We were therefore buried with Him through baptism into death in order that, just as Christ was raised from the dead through the glory of the Father, we too may live a new life” (Romans 6:4).
Luther explains: “What does such baptizing with water indicate? It indicates that the Old Adam in us should by daily contrition and repentance be drowned and die with all sins and evil desires, and that a new man should daily emerge and arise to live before God in righteousness and purity forever.”
Salvageable adds: The Psalms tell God’s people to sing a new song to the Lord. Jesus tells his disciples that he gives them a new commandment, to love one another. Paul tells Christians that each of them is a new creation. Through Holy Baptism Christians are born again and become new. Even though baptism happens only once, it causes a Christian to be new every day.
Luther writes about daily contrition and repentance. Contrition means being sorry for our sins. Repentance means turning around—turning away from our sins, and at the same time turning to the Lord. By regenerating the Christian, baptism makes this sorrow and this change happen. Every day we sin, but every day we are new people, regenerated by Holy Baptism, able to repent and to be pure and holy in the sight of the Lord.
Holy Baptism connects the Christian to the death, burial, and resurrection of Jesus. Jesus died only once to redeem us, and he rose only once to live forever in his Kingdom. A Christian is baptized only once. Yet because of the death and resurrection of Christ, a Christian lives a new life every day. Because of Holy Baptism, a Christian lives a new life every day.
We look forward to the new creation, a world without sin or evil or death or tears. Eternal life is guaranteed to us by the death and resurrection of Jesus. Holy Baptism connects us to that guarantee. When we struggle with doubts, when we question whether our faith is strong enough to save us, when we are overwhelmed with shame because of our sins, Holy Baptism assures us that the promises of God remain true. They are true eternally, and they are true for each of us. Already today we have eternal life, through the grace of God and through his promises.