Hebrew: “circumcise the foreskin your heart.” God is asking for a broken or contrite heart. In the scriptures we are told to “circumcise” our hearts. God wants us to come to Him willingly, to choose to follow Him because of our love for Him. And with that love He wants us to have a heart that will do as He asks.
See Deuteronomy 10:16, 30:6; 2 Nephi 6:67 RAV, 9:33 OPV; Jeremiah 4:4; 3 Nephi 4:49 RAV, 9:20 OPV; Romans 2:25-29, 1 Corinthians 7:19; Colossians 2:10-1; Born again.