In Deuteronomy 30:6 we read, “And the Lord your God will circumcise your heart and the heart of your offspring, so that you will love the Lord your God with all your heart and with all your soul, that you may live.” If the circumcision of the heart refers to regeneration (cf. Rom. 2:25–27), then to what purpose does God promise to circumcise the heart? He circumcises the heart “so that” his people will love the Lord. The Lord does not circumcise their hearts “because” they acted in repentance and faith by loving the Lord. Rather, it is God’s sovereign act of circumcising the heart that causes the sinner to love him. Nowhere in Deuteronomy 30:6 do we see any indication that God’s sovereign act of circumcising the heart is conditioned on the will of man to believe. Rather, it is quite the opposite. The Lord must first circumcise the heart so that the sinner can exercise a will that believes.
Expound on the Gospel: "that Christ died for our sins according to the Scriptures, and that He was buried, and that He was raised on the third day according to the Scriptures." 1 Corinthians 15:3-5