Texts Explained; Sixthly, the Context of Proverbs 8:22, and application of it to created Wisdom as seen in the works. The Son reveals the Father, first by the works, then by the Incarnation
But since the heretics, reading the next verse, take a perverse view of that also, because it is written, 'He founded me before the world,' namely, that this is said of the Godhead of the Word and not of His incarnate Presence, it is necessary, explaining this verse also, to show their error.
73. It is written, 'The Lord in Wisdom founded the earth;' if then by Wisdom the earth is founded, how can He who founds be founded? Nay, this too is said after the manner of proverbs, and we must in like manner investigate its sense; that we may know that, while by Wisdom the Father frames and founds the earth to be firm and steadfast, Wisdom Itself is founded for us, that It may become beginning and foundation of our new creation and renewal. Accordingly here as before, He says not, 'Before the world He has made me Word or Son,' lest there should be as it were a beginning of His making. For this we must seek before all things, whether He is Son, 'and on this point specially search the Scriptures;' for this it was, when the Apostles were questioned, that Peter answered, saying, 'You are the Christ, the Son of the Living God.' This also the father of the Arian heresy asked as one of his first questions; 'If Thou be the Son of God;' for he knew that this is the truth and the sovereign principle of our faith; and that, if He were Himself the Son, the tyranny of the devil would have its end; but if He were a creature, He too was one of those descended from that Adam whom he deceived, and he had no cause for anxiety. For the same reason the Jews of the day were angered, because the Lord said that He was Son of God, and that God was His proper Father. For had He called Himself one of the creatures, or said, 'I am a work,' they had not been startled at the intelligence, nor thought such words blasphemy, knowing, as they did, that even Angels had come among their fathers; but since He called Himself Son, they perceived that such was not the note of a creature, but of Godhead and of the Father's nature. The Arians then ought, even in imitation of their own father the devil, to take some special pains on this point; and if He has said, 'He founded me to be Word or Son,' then to think as they do; but if He has not so spoken, not to invent for themselves what is not.
74. For He says not, 'Before the world He founded me as Word or Son,' but simply, 'He founded me,' to show again, as I have said, that not for His own sake but for those who are built upon Him does He here also speak, after the way of proverbs. For this knowing, the Apostle also writes, 'Other foundation can no man lay than that is laid, which is Jesus Christ; but let every man take heed how he builds thereupon. ' And it must be that the foundation should be such as the things built on it, that they may admit of being well compacted together. Being then the Word, He has not, as Word, any such as Himself, who may be compacted with Him; for He is Only-begotten; but having become man, He has the like of Him, those namely the likeness of whose flesh He has put on. Therefore according to His manhood He is founded, that we, as precious stones, may admit of building upon Him, and may become a temple of the Holy Ghost who dwells in us. And as He is a foundation, and we stones built upon Him, so again He is a Vine and we knit to Him as branches—not according to the Essence of the Godhead; for this surely is impossible; but according to His manhood, for the branches must be like the vine, since we are like Him according to the flesh. Moreover, since the heretics have such human notions, we may suitably confute them with human resemblances contained in the very matter they urge. Thus He says not, 'He made me a foundation,' lest He might seem to be made and to have a beginning of being, and they might thence find a shameless occasion of irreligion; but, 'He founded me.' Now what is founded is founded for the sake of the stones which are raised upon it; it is not a random process, but a stone is first transported from the mountain and set down in the depth of the earth. And while a stone is in the mountain, it is not yet founded; but when need demands, and it is transported, and laid in the depth of the earth, then immediately if the stone could speak, it would say, 'He now founded me, who brought me hither from the mountain.' Therefore the Lord also did not when founded take a beginning of existence; for He was the Word before that; but when He put on our body, which He severed and took from Mary, then He says 'He has founded me;' as much as to say, 'Me, being the Word, He has enveloped in a body of earth.' For so He is founded for our sakes, taking on Him what is ours, that we, as incorporated and compacted and bound together in Him through the likeness of the flesh, may attain unto a perfect man, and abide immortal and incorruptible.
75. Nor let the words 'before the world' and 'before He made the earth' and 'before the mountains were settled' disturb any one; for they very well accord with 'founded' and 'created;' for here again allusion is made to the Economy according to the flesh. For though the grace which came to us from the Saviour appeared, as the Apostle says, just now, and has come when He sojourned among us; yet this grace had been prepared even before we came into being, nay, before the foundation of the world, and the reason why is kindly and wonderful. It beseemed not that God should counsel concerning us afterwards, lest He should appear ignorant of our fate. The God of all then—creating us by His own Word, and knowing our destinies better than we, and foreseeing that, being made 'good,' we should in the event be transgressors of the commandment, and be thrust out of paradise for disobedience—being loving and kind, prepared beforehand in His own Word, by whom also He created us, the Economy of our salvation; that though by the serpent's deceit we fell from Him, we might not remain quite dead, but having in the Word the redemption and salvation which was afore prepared for us, we might rise again and abide immortal, what time He should have been created for us 'a beginning of the ways,' and He who was the 'First-born of creation' should become 'first-born' of the 'brethren,' and again should rise 'first-fruits of the dead.' This Paul the blessed Apostle teaches in his writings; for, as interpreting the words of the Proverbs 'before the world' and 'before the earth was,' he thus speaks to Timothy; 'Be partaker of the afflictions of the Gospel according to the power of God, who has saved us and called us with a holy calling, not according to our works, but according to His own purpose and grace, which was given us in Christ Jesus before the world began, but is now made manifest by the appearing of our Saviour Jesus Christ, who has abolished death, and brought to light life.' And to the Ephesians; 'Blessed be God even the Father of our Lord Jesus Christ, who has blessed us with all spiritual blessing in heavenly places in Christ Jesus, according as He has chosen us in Him before the foundation of the world, that we should be holy and without blame before Him in love, having predestinated us to the adoption of children by Jesus Christ to Himself.'
Source: Four Discourses Against the Arians (New Advent)