I do not admit either solution, and I declare that your question contains an absurdity, and not a difficulty to answer. If however you think, in accordance with your dialectic assumptions, that one or other of these alternatives must necessarily be true in every case, let me ask you one little question: Is time in time, or is it not in time? If it is contained in time, then in what time, and what is it but that time, and how does it contain it? But if it is not contained in time, what is that surpassing wisdom which can conceive of a time which is timeless? Now, in regard to this expression, “I am now telling a lie,” admit one of these alternatives, either that it is true, or that it is a falsehood, without qualification (for we cannot admit that it is both). But this cannot be. For necessarily he either is lying, and so is telling the truth, or else he is telling the truth, and so is lying. What wonder is it then that, as in this case contraries are true, so in that case they should both be untrue, and so your clever puzzle prove mere foolishness? Solve me one more riddle. Were you present at your own generation, and are you now present to yourself, or is neither the case? If you were and are present, who were you, and with whom are you present? And how did your single self become thus both subject and object? But if neither of the above is the case, how did you get separated from yourself, and what is the cause of this disjoining? But, you will say, it is stupid to make a fuss about the question whether or no a single individual is present to himself; for the expression is not used of oneself but of others. Well, you may be certain that it is even more stupid to discuss the question whether That which was begotten from the beginning existed before its generation or not. For such a question arises only as to matter divisible by time.
X. But they say, The Unbegotten and the Begotten are not the same; and if this is so, neither is the Son the same as the Father. It is clear, without saying so, that this line of argument manifestly excludes either the Son or the Father from the Godhead. For if to be Unbegotten is the Essence of God, to be begotten is not that Essence; if the opposite is the case, the Unbegotten is excluded. What argument can contradict this? Choose then whichever blasphemy you prefer, my good inventor of a new theology, if indeed you are anxious at all costs to embrace a blasphemy. In the next place, in what sense do you assert that the Unbegotten and the Begotten are not the same? If you mean that the Uncreated and the created are not the same, I agree with you; for certainly the Unoriginate and the created are not of the same nature. But if you say that He That begot and That which is begotten are not the same, the statement is inaccurate. For it is in fact a necessary truth that they are the same. For the nature of the relation of Father to Child is this, that the offspring is of the same nature with the parent. Or we may argue thus again. What do you mean by Unbegotten and Begotten, for if you mean the simple fact of being unbegotten or begotten, these are not the same; but if you mean Those to Whom these terms apply, how are They not the same? For example, Wisdom and Unwisdom are not the same in themselves, but yet both are attributes of man, who is the same; and they mark not a difference of essence, but one external to the essence. Are immortality and innocence and immutability also the essence of God? If so God has many essences and not one; or Deity is a compound of these. For He cannot be all these without composition, if they be essences.
XI. They do not however assert this, for these qualities are common also to other beings. But God's Essence is that which belongs to God alone, and is proper to Him. But they, who consider matter and form to be unbegotten, would not allow that to be unbegotten is the property of God alone (for we must cast away even further the darkness of the Manichæans). But suppose that it is the property of God alone. What of Adam? Was he not alone the direct creature of God? Yes, you will say. Was he then the only human being? By no means. And why, but because humanity does not consist in direct creation? For that which is begotten is also human. Just so neither is He Who is Unbegotten alone God, though He alone is Father. But grant that He Who is Begotten is God; for He is of God, as you must allow, even though you cling to your Unbegotten. Then how do you describe the Essence of God? Not by declaring what it is, but by rejecting what it is not. For your word signifies that He is not begotten; it does not present to you what is the real nature or condition of that which has no generation. What then is the Essence of God? It is for your infatuation to define this, since you are so anxious about His Generation too; but to us it will be a very great thing, if ever, even in the future, we learn this, when this darkness and dulness is done away for us, as He has promised Who cannot lie. This then may be the thought and hope of those who are purifying themselves with a view to this. Thus much we for our part will be bold to say, that if it is a great thing for the Father to be Unoriginate, it is no less a thing for the Son to have been Begotten of such a Father. For not only would He share the glory of the Unoriginate, since he is of the Unoriginate, but he has the added glory of His Generation, a thing so great and august in the eyes of all those who are not altogether grovelling and material in mind.
XII. But, they say, if the Son is the Same as the Father in respect of Essence, then if the Father is unbegotten, the Son must be so likewise. Quite so— if the Essence of God consists in being unbegotten; and so He would be a strange mixture, begottenly unbegotten. If, however, the difference is outside the Essence, how can you be so certain in speaking of this? Are you also your father's father, so as in no respect to fall short of your father, since you are the same with him in essence? Is it not evident that our enquiry into the Nature of the Essence of God, if we make it, will leave Personality absolutely unaffected? But that Unbegotten is not a synonym of God is proved thus. If it were so, it would be necessary that since God is a relative term, Unbegotten should be so likewise; or that since Unbegotten is an absolute term, so must God be....God of no one. For words which are absolutely identical are similarly applied. But the word Unbegotten is not used relatively. For to what is it relative? And of what things is God the God? Why, of all things. How then can God and Unbegotten be identical terms? And again, since Begotten and Unbegotten are contradictories, like possession and deprivation, it would follow that contradictory essences would co-exist, which is impossible. Or again, since possessions are prior to deprivations, and the latter are destructive of the former, not only must the Essence of the Son be prior to that of the Father, but it must be destroyed by the Father, on your hypothesis.
Source: Orations (New Advent)