John 1:13

Who were born, not of blood, nor of the will of the flesh, nor the will of man, but of God.

New birth is a condition of salvation, and it was assumed by John that believers who received the right to become God's children would exercise it by obedience of the gospel, thus being born again (see under John 3:5); and the burden of the thought in this verse is that the new birth is of God, spiritual, and from above, and that it does not derive from Abrahamic descent, that is, "of blood," nor "of the flesh" nor "of the will of man." The new birth is not caused by, nor does it follow, sexual activity, whether of men or of women. Two thoughts in this verse were developed later in the Gospel - that of the new birth in John 3, and that of the true children of Abraham in John 8.