Read Romans 10:5-15
5 Moses wrote this about being put right with God by obeying the Law: “Whoever obeys the commands of the Law will live.” 6But what the scripture says about being put right with God through faith is this: “You are not to ask yourself, Who will go up into heaven?” (that is, to bring Christ down). 7“Nor are you to ask, Who will go down into the world below?” (that is, to bring Christ up from death). 8What it says is this: “God’s message is near you, on your lips and in your heart”—that is, the message of faith that we preach. 9If you confess that Jesus is Lord and believe that God raised him from death, you will be saved. 10For it is by our faith that we are put right with God; it is by our confession that we are saved. 11The scripture says, “Whoever believes in him will not be disappointed.” 12This includes everyone, because there is no difference between Jews and Gentiles; God is the same Lord of all and richly blesses all who call to him. 13As the scripture says, “Everyone who calls out to the Lord for help will be saved.”
14 But how can they call to him for help if they have not believed? And how can they believe if they have not heard the message? And how can they hear if the message is not proclaimed? 15And how can the message be proclaimed if the messengers are not sent out? As the scripture says, “How wonderful is the coming of messengers who bring good news!”
Verses 6-8 interpret a part of Deuteronomy chapter 30 - in Deuteronomy 30 God promises to give people 'circumcised hearts.' Hearts transformed by his love and grace. As he writes Romans he wants his readers to understand that Jesus fulfills this promise from Deuteronomy 30 and our hearts are changed through trust in Jesus as resurrected Lord.
Lord Jesus, I believe in you; transform my heart.