Hebrews 7:3

Therefore, in this general and primordial law of God, the observance of which, in the case of the tree’s fruit, He had sanctioned, we recognise en closed all the precepts specially of the posterior Law, which germinated when dis closed at their proper times. For the subsequent superinduction of a law is the work of the same Being who had before premised a precept; since it is His province withal subsequently to train, who had before resolved to form, righteous creatures. For what wonder if He extends a discipline who institutes it? if He advances who begins? In short, before the Law of Moses, written in stone-tables, I contend that there was a law unwritten, which was habitually understood naturally, and by the fathers was habitually kept. …

After him brake out a second heretical Theodotus, who again himself introduced a sister-sect, and says that the human being Christ Himself was merely conceived alike, and born, of the Holy Spirit and the Virgin Mary, but that He was inferior to Melchizedek; because it is said of Christ, “Thou art a priest unto eternity, after the order of Melchizedek.” For that Melchizedek, he says, was a heavenly Virtue of pre-eminent grace; in that Christ acts for human beings, being made their Deprecator and Advocate: Melchizedek does so for heavenly angels and Virtues. For to such a degree, he says, is he better than Christ, that he is ἀπάτωρ (fatherless), ἀμήτωρ (motherless), ἀγενεαλογητον (without genealogy), of whom neither the beginning nor the end has been comprehended, nor can be comprehended.

Moreover, if He be not Co-eternal with the Father, how can you say that His Life is infinite? For if it have a beginning from before, although it be endless, yet it is not infinite; for the infinite must be infinite in both directions. As Paul also declared, when he said, “Having neither beginning of days, nor end of life” ( Heb. vii. 3 ); by this expression showing that He is both without beginning and without end. For as the one has no limit, so neither has the other. In one direction there is no end, in the other no beginning.

Eran. I think the words of the divine Apostle are as follows; “For this Melchisedec, king of Salem, priest of the most high God who met Abraham returning from the slaughter of the kings, and blessed him; to whom also Abraham gave a tenth part of all; first being by interpretation king of righteousness, and after that also king of Salem, which is king of peace; without father, without mother, without descent, having neither beginning of days, nor end of life; but made like unto the son of God; abideth a priest continually.” I presume you spoke of this passage.

Orth. For any one willing to consider it with attention it will not be hard to attain perception of the meaning of the words. After saying “without father, without mother, without descent, having neither beginning of days nor end of life,” the divine Apostle adds “made like unto the Son of God, abideth a priest continually.” Here he plainly teaches us that the Lord Christ is archetype of Melchisedec in things concerning the human nature. And he speaks of Melchisedec as “made like unto the Son of God.” Now let us examine the point in this manner; do you say that the Lord had a father according to the flesh?

Orth. Thus too the divine Apostle said that Melchisedec is made like unto the Son of God.

On account of this difference of term He is said by the divine Paul to be “without father, without mother, without descent, having neither beginning of days nor end of life.” He is without father as touching His humanity; for as man He was born of a mother alone. And He is without mother as God, for He was begotten from everlasting of the Father alone. And again He is without descent as God while as man He has descent. For it is written “The book of the generation of Jesus Christ the son of David, the son of Abraham.” His descent is also given by the divine Luke. So again, as God, He has no beginning of days for He was begotten before the ages; neither has He an end of life, for His nature is immortal and impassible. But as man He had both a beginning of days, for He was born in the reign of Augustus Cæsar, and an end of life, for He was crucified in the reign of Tiberius Cæsar. …

But, perhaps, some one amongst even very religious people will pause over these investigations of ours upon God’s eternity, and say that it will be difficult from what we have said for the Faith in the Only-begotten to escape unhurt. Of two unacceptable doctrines, he will say, our account must inevitably be brought into contact with one. Either we shall make out that the Son is Ungenerate, which is absurd; or else we shall deny Him Eternity altogether, a denial which that fraternity of blasphemers make their specialty. For if Eternity is characterized by having no beginning and end, it is inevitable either that we must be impious and deny the Son Eternity, or that we must be led in our secret thoughts about Him into the idea of Ungeneracy. …

One mark of the true Godhead is indicated by the words of Holy Scripture, which Moses learnt by the voice from heaven, when He heard Him Who said, “I am He that is.” We think it right, then, to believe that to be alone truly Divine which is represented as eternal and infinite in respect of being; and all that is contemplated therein is always the same, neither growing nor being consumed; so that if one should say of God, that formerly He was, but now is not, or that He now is, but formerly was not, we should consider each of the sayings alike to be godless: for by both alike the idea of eternity is mutilated, being cut short on one side or the other by non-existence, whether one contemplates “nothing” as preceding “being,” or declares that “being” ends in “nothing”; and the frequent repetition of “first of all” or “last of all” concerning God’s non-existence does not make amends for the …

I pass in silence his blasphemy in reducing God the Only-begotten to a level with all created things, and, in a word, allowing to the Son of God no higher honour than theirs. Still, for the sake of my more intelligent hearers, I will here give an instance of his insensate malice. Basil, he says, lends God the primacy over all things by reference to the ages. What unintelligible nonsense is this! Man is made God’s patron, and gives to God a primacy owing to the ages! What is this vain flourish of baseless expressions, seeing that our Master simply says that whatever in the Divine essence transcends the measurable distances of the ages in either direction is called by certain distinctive names, in the case of Him Who, as saith the Apostle, hath neither beginning of days nor end of life, in order that the distinction of the conception might be marked by distinction in the names. …

You then make use of the holy Scriptures against God, and try to bring His own witnesses against Him. But how? Truly so as to become a false accuser not only of God, but of the evidences themselves. Nor indeed is it wonderful that, as you cannot do what you want, you only do what you can: as you cannot turn the sacred witnesses against God, you do what you can, and pervert them. For you say: Then Paul tells a lie, when he says of Christ: “Without mother, without genealogy.” I ask you, of whom do you think that Paul said this? Of the Son and Word of God, or of the Christ, whom you separate from the Son of God, and blasphemously assert to be a mere man? If of the Christ, whom you maintain to be a mere man, how could a man be born without a mother and without a genealogy on the mother’s side? But if of the Word of God and Son of God, what can we make of it, when the same Apostle, your own w …