Origen,
Ante-Nicene Fathers Vol. IV, Origen…
(1885)
“ To them Jesus Christ is an all-sufficient Lord, who Himself instructs them, in order that when fully instructed He may form them into a kingdom worthy of God, and present them to God the Father. But indeed they do in a sense separate themselves and stand aloof from those who are aliens from the commonwealth of God and strangers to His covenants, in order that they may live as citizens of heaven, “coming to the living God, and to the city of God, the heavenly Jerusalem, and to an innumerable company of angels, to the general assembly and Church of the first-born, which are written in heaven.” ”
