John 1:13

John 1:13. Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.

So that those who receive Christ, those who truly believe on Christ, are people who have been born, as others have not been born, by a new birth from heaven, a supernatural birth, so that they are a people set apart by themselves as those who have been twice created, first as human beings just like others, and then as new creatures in Christ Jesus.