10 He was in the world, and the world was made through Him, and the world did not know Him. 11 He came to His own, (the Jews) and those who were His own did not receive Him.
12 But as many as received Him (Jews and Gentiles), to them He gave the right to become children of God, even to those who believe in His name,
13 who were born, not of blood nor of the will of the flesh nor of the will of man, but of God.
who were born physically, (blood) not by their own will (flesh), nor of anyone's will , but by God's own purpose and will.
Anyone's will is harder to explain, but one of the ways a Jew was a Jew was by education, or place in their society instead of being a Jew spiritually.