The Epistle of Alexander, Bishop of Alexandria to Alexander, Bishop of Constantinople
These then are the questions I have to raise, according to the ability I possess, with those who from their rude resources throw dust on the Christ, and try to slander our reverence for Him. These inventors of silly tales assert that we, who reject their impious and unscriptural blasphemy concerning the creation of Christ from the non-existent, teach that there are two unbegotten Beings. For these ill-instructed men contend that one of these alternatives must hold; either He must be believed to have come out of the non-existent, or there are two unbegotten Beings. In their ignorance and want of practice in theology they do not realize how vast must be the distance between the Father who is uncreate, and the creatures, whether rational or irrational, which He created out of the non-existent; and that the only-begotten nature of Him Who is the Word of God, by Whom the Father created the universe out of the non-existent, standing, as it were, in the middle between the two, was begotten of the self-existent Father, as the Lord Himself testified when He said, ' Every one that loves the Father, loves also the Son that is begotten of Him. '
We believe, as is taught by the Church, in an only unbegotten Father, Who of His being has no cause, immutable and invariable, and Who subsists always in one state of being, admitting neither of progression nor of diminution; Who gave the law, and the prophets, and the gospel; of patriarchs and apostles, and of all saints, Lord: and in one Lord Jesus Christ, the only-begotten Son of God, begotten not out of that which is not, but of the Father, Who is; yet not after the manner of material bodies, by severance or emanation, as Sabellius and Valentinus taught; but in an inexpressible and inexplicable manner, according to the saying which we quoted above, ' Who shall declare His generation?' since no mortal intellect can comprehend the nature of His Person, as the Father Himself cannot be comprehended, because the nature of reasonable beings is unable to grasp the manner in which He was begotten of the Father.
But those who are led by the Spirit of truth have no need to learn these things of me, for the words long since spoken by the Saviour yet sound in our ears, ' No one knows who the Father is but the Son, and no one knows who the Son is but the Father. ' We have learned that the Son is immutable and unchangeable, all-sufficient and perfect, like the Father, lacking only His “unbegotten.” He is the exact and precisely similar image of His Father. For it is clear that the image fully contains everything by which the greater likeness exists, as the Lord taught us when He said, ' My Father is greater than I. ' And in accordance with this we believe that the Son always existed of the Father; for he is the brightness of His glory, and the express image of His Father's Person. But let no one be led by the word ' always' to imagine that the Son is unbegotten, as is thought by some who have their intellects blinded: for to say that He was, that He has always been, and that before all ages, is not to say that He is unbegotten.
The mind of man could not possibly invent a term expressive of what is meant by being unbegotten. I believe that you are of this opinion; and, indeed, I feel confident in your orthodox view that none of these terms in any way signify the unbegotten. For all the terms appear to signify merely the extension of time, and are not adequate to express the divinity and, as it were, the primæval being of the only-begotten Son. They were used by the holy men who earnestly endeavoured to clear up the mystery, and who asked pardon from those who heard them, with a reasonable excuse for their failure, by saying 'as far as our comprehension has reached.' But if those who allege that what was ' known in part' has been ' done away ' for them, expect from human lips anything beyond human powers, it is plain that the terms 'was,' and 'ever,' and 'before all ages,' fall far short of this expectation. But whatever they may mean, it is not the same as 'the unbegotten.' Therefore His own individual dignity must be reserved to the Father as the Unbegotten One, no one being called the cause of His existence: to the Son likewise must be given the honour which befits Him, there being to Him a generation from the Father which has no beginning; we must render Him worship, as we have already said, only piously and religiously ascribing to Him the 'was' and the 'ever,' and the 'before all ages;' not however rejecting His divinity, but ascribing to Him a perfect likeness in all things to His Father, while at the same time we ascribe to the Father alone His own proper glory of 'the unbegotten,' even as the Saviour Himself says, ' My Father is greater than I. '
And in addition to this pious belief respecting the Father and the Son, we confess as the Sacred Scriptures teach us, one Holy Ghost, who moved the saints of the Old Testament, and the divine teachers of that which is called the New. We believe in one only Catholic Church, the, which cannot be destroyed even though all the world were to take counsel to fight against it, and which gains the victory over all the impious attacks of the heterodox; for we are emboldened by the words of its Master, ' Be of good cheer, I have overcome the world. ' After this, we receive the doctrine of the resurrection from the dead, of which Jesus Christ our Lord became the first-fruits; Who bore a Body, in truth, not in semblance, derived from Mary the mother of God; in the fullness of time sojourning among the race, for the remission of sins: who was crucified and died, yet for all this suffered no diminution of His Godhead. He rose from the dead, was taken into heaven, and sat down at the right hand of the Majesty on high.
In this epistle I have only mentioned these things in part, deeming it, as I have said, wearisome to dwell minutely on each article, since they are well known to your pious diligence. These things we teach, these things we preach; these are the dogmas of the apostolic Church, for which we are ready to die, caring little for those who would force us to forswear them; for we will never relinquish our hope in them, though they should try to compel us by tortures.
Arius and Achillas, together with their fellow foes, have been expelled from the Church, because they have become aliens from our pious doctrine: according to the blessed Paul, who said, 'If any of you preach any other gospel than that which you have received, let him be accursed, even though he should pretend to be an angel from heaven, and ' But if any man teach otherwise, and consent not to wholesome words, even the words of our Lord Jesus Christ, and to the doctrine which is according to godliness, he is proud, knowing nothing,' and so forth. Since, then, they have been condemned by the brotherhood, let none of you receive them, nor attend to what they say or write. They are deceivers, and propagate lies, and they never adhere to the truth. They go about to different cities with no other intent than to deliver letters under the pretext of friendship and in the name of peace, and by hypocrisy and flattery to obtain other letters in return, in order to deceive a few ' silly women who are laden with sins. ' I beseech you, beloved brethren, to avoid those who have thus dared to act against Christ, who have publicly held up the Christian religion to ridicule, and have eagerly sought to make a display before judicial tribunals, who have endeavoured to excite a persecution against us at a period of the most entire peace, and who have enervated the unspeakable mystery of the generation of Christ. Unite unanimously in opposition to them, as some of our fellow-ministers have already done, who, being filled with indignation, wrote to me against them, and signed our formulary.
Source: Ecclesiastical History (New Advent)