The wind blows where it wills, and you hear the sound thereof, but can not tell from where it came, and where it goes: so is everyone that is born of the Spirit.
All Commentaries on John 3:8 Go To John 3
On Re-Baptism (Anonymous)
AD 300
And the Spirit, indeed, continues to this day invisible to men, as the Lord says, "The Spirit breathes where He will; and thou knowest not whence He cometh, or whither He goeth."