Further to the above we have theses related ideas:-
The following is contrasting Begotten with unbegotten taken from: THE ANTE-NICENE FATHERS The Writings of the Fathers down to A.D. 325 THE REV. ALEXANDER ROBERTS, D.D., AND JAMES DONALDSON, LL.D., EDITORS AMERICAN REPRINT OF THE EDINBURGH EDITION VOLUME 1 THE APOSTOLIC FATHERS JUSTIN MARTYR IRENAEUS
"THE EPISTLE OF IGNATIUS TO THE EPHESIANS Ch.7 p.105 But our Physician is the only true God, the unbegotten and unapproachable, the Lord of all, the Father and Begetter of the only-begotten Son. We have also as a Physician the Lord our God, Jesus the Christ, the only-begotten Son and Word, before time began, but who afterwards became also man, of Mary the virgin. For “the Word was made flesh.”"
THE EPISTLE OF IGNATIUS TO THE MAGNESIANS CH.7 p.125 "Do ye all, as one man, run together into the temple of God, as unto one altar, to one Jesus Christ, the High Priest of the unbegotten God."
THE EPISTLE OF IGNATIUS TO THE PHILADELPHIANS Ch.4 p161 "Since, also, there is but one unbegotten Being, God, even the Father; and one only-begotten Son, God, the Word and man. . . ."
THE EPISTLE OF IGNATIUS TO THE ANTIOCHIANS CHAPTER 14 p.217 CONCLUSION "I write this letter to you from Philippi. May He who is alone unbegotten, keep you steadfast both in the spirit and in the flesh, through Him who was begotten before time began! And may I behold you in the kingdom of Christ! I salute him who is to bear rule over you in my stead: may I have joy of him in the Lord! Fare ye well in God, and in Christ, being enlightened by the Holy Spirit."
THE SECOND APOLOGY OF JUSTIN Ch.6 p.353 NAMES OF GOD AND OF CHRIST, THEIR MEANING AND POWER "But to the Father of all, who is unbegotten, . . . And His son, who alone is properly called Son, the Word, who also was with him and was begotten before the works, when at first He created and arranged all things by Him, is called Christ. . ." ibid. Ch.12 p.358 "we have the unbegotten and ineffable God as witness both of our thoughts and deeds." ibid. Ch.13 p.359 "For next to God, we worship and love the Word who is from the unbegotten and ineffable God, since also He became man for our sakes, that, becoming a partaker of our sufferings, He might also bring us healing."
DIALOGUE OF JUSTIN PHILOSOPHER AND MARTYR WITH TRYPHO, A JEW Ch.5 p.370 "God alone is unbegotten and incorruptible, and therefore He is God, but all other things after Him are created and corruptible."