On Christ
1 In the first place, we must note that the nature of that deity which is in Christ in respect of His being the only-begotten Son of God is one thing, and that human nature which He assumed in these last times for the purposes of the dispensation (of grace) is another. And therefore we have first to ascertain what the only-begotten Son of God is, seeing He is called by many different names, according to the circumstances and views of individuals. For He is termed Wisdom, according to the expression of Solomon: “The Lord created me— the beginning of His ways, and among His works, before He made any other thing; He founded me before the ages. In the beginning, before He formed the earth, before He brought forth the fountains of waters, before the mountains were made strong, before all the hills, He brought me forth.” He is also styled First-born, as the apostle has declared: “who is the first-born of every creature.” The first-born, however, is not by nature a different person from the Wisdom, but one and the same. Finally, the Apostle Paul says that “Christ (is) the power of God and the wisdom of God.”
2. Let no one, however, imagine that we mean anything impersonal when we call Him the wisdom of God; or suppose, for example, that we understand Him to be, not a living being endowed with wisdom, but something which makes men wise, giving itself to, and implanting itself in, the minds of those who are made capable of receiving His virtues and intelligence. If, then, it is once rightly understood that the only-begotten Son of God is His wisdom hypostatically existing, I know not whether our curiosity ought to advance beyond this, or entertain any suspicion that that ὑπόστασις or substantia contains anything of a bodily nature, since everything that is corporeal is distinguished either by form, or colour, or magnitude. And who in his sound senses ever sought for form, or colour, or size, in wisdom, in respect of its being wisdom? And who that is capable of entertaining reverential thoughts or feelings regarding God, can suppose or believe that God the Father ever existed, even for a moment of time, without having generated this Wisdom? For in that case he must say either that God was unable to generate Wisdom before He produced her, so that He afterwards called into being her who formerly did not exist, or that He possessed the power indeed, but— what cannot be said of God without impiety— was unwilling to use it; both of which suppositions, it is patent to all, are alike absurd and impious: for they amount to this, either that God advanced from a condition of inability to one of ability, or that, although possessed of the power, He concealed it, and delayed the generation of Wisdom. Wherefore we have always held that God is the Father of His only-begotten Son, who was born indeed of Him, and derives from Him what He is, but without any beginning, not only such as may be measured by any divisions of time, but even that which the mind alone can contemplate within itself, or behold, so to speak, with the naked powers of the understanding. And therefore we must believe that Wisdom was generated before any beginning that can be either comprehended or expressed. And since all the creative power of the coming creation was included in this very existence of Wisdom (whether of those things which have an original or of those which have a derived existence), having been formed beforehand and arranged by the power of foreknowledge; on account of these very creatures which had been described, as it were, and prefigured in Wisdom herself, does Wisdom say, in the words of Solomon, that she was created the beginning of the ways of God, inasmuch as she contained within herself either the beginnings, or forms, or species of all creation.
3. Now, in the same way in which we have understood that Wisdom was the beginning of the ways of God, and is said to be created, forming beforehand and containing within herself the species and beginnings of all creatures, must we understand her to be the Word of God, because of her disclosing to all other beings, i.e., to universal creation, the nature of the mysteries and secrets which are contained within the divine wisdom; and on this account she is called the Word, because she is, as it were, the interpreter of the secrets of the mind. And therefore that language which is found in the Acts of Paul, where it is said that “here is the Word a living being,” appears to me to be rightly used. John, however, with more sublimity and propriety, says in the beginning of his Gospel, when defining God by a special definition to be the Word, “And God was the Word, and this was in the beginning with God.” Let him, then, who assigns a beginning to the Word or Wisdom of God, take care that he be not guilty of impiety against the unbegotten Father Himself, seeing he denies that He had always been a Father, and had generated the Word, and had possessed wisdom in all preceding periods, whether they be called times or ages, or anything else that can be so entitled.
4. This Son, accordingly, is also the truth and life of all things which exist. And with reason. For how could those things which were created live, unless they derived their being from life? Or how could those things which are, truly exist, unless they came down from the truth? Or how could rational beings exist, unless the Word or reason had previously existed? Or how could they be wise, unless there were wisdom? But since it was to come to pass that some also should fall away from life, and bring death upon themselves by their declension— for death is nothing else than a departure from life— and as it was not to follow that those beings which had once been created by God for the enjoyment of life should utterly perish, it was necessary that, before death, there should be in existence such a power as would destroy the coming death, and that there should be a resurrection, the type of which was in our Lord and Saviour, and that this resurrection should have its ground in the wisdom and word and life of God. And then, in the next place, since some of those who were created were not to be always willing to remain unchangeable and unalterable in the calm and moderate enjoyment of the blessings which they possessed, but, in consequence of the good which was in them being theirs not by nature or essence, but by accident, were to be perverted and changed, and to fall away from their position, therefore was the Word and Wisdom of God made the Way. And it was so termed because it leads to the Father those who walk along it.
Whatever, therefore, we have predicated of the wisdom of God, will be appropriately applied and understood of the Son of God, in virtue of His being the Life, and the Word, and the Truth and the Resurrection: for all these titles are derived from His power and operations, and in none of them is there the slightest ground for understanding anything of a corporeal nature which might seem to denote either size, or form, or colour; for those children of men which appear among us, or those descendants of other living beings, correspond to the seed of those by whom they were begotten, or derive from those mothers, in whose wombs they are formed and nourished, whatever that is, which they bring into this life, and carry with them when they are born. But it is monstrous and unlawful to compare God the Father, in the generation of His only-begotten Son, and in the substance of the same, to any man or other living thing engaged in such an act; for we must of necessity hold that there is something exceptional and worthy of God which does not admit of any comparison at all, not merely in things, but which cannot even be conceived by thought or discovered by perception, so that a human mind should be able to apprehend how the unbegotten God is made the Father of the only-begotten Son. Because His generation is as eternal and everlasting as the brilliancy which is produced from the sun. For it is not by receiving the breath of life that He is made a Son, by any outward act, but by His own nature.
Source: De Principiis (New Advent)