45 We must also enquire what is the meaning of the saying that God, born before the ages, was again created for the beginning of the ways of God and for His works. This surely is said because where there is a birth before the commencement of the ages, there is the eternity of an endless generation: but where the same birth is represented as a creation from the commencement of the ages, for the ways of God and for His works, it is applied as the creative cause to the works and to the ways.
And first, since Christ is Wisdom, we must see whether He is Himself the beginning of the way of the works of God. Of this, I think, there is no doubt; for He says, I am the way, and, No man comes to the Father except through Me. A way is the guide of those who go, the course marked out for those who hasten, the safeguard of the ignorant, a teacher, so to speak, of things unknown and longed for. Therefore He is created for the beginning of the ways, for the works of God; because He is the Way and leads men to the Father.
But we must seek for the purpose of this creation, which is from the commencement of the ages. For it is also the mystery of the last dispensation, wherein Christ was again created in bodily form, and declared that He was the way of the works of God. Again, He was created for the ways of God from the commencement of the ages, when, subjecting Himself to the visible form of a creature, He took the form of a created being.
Source: On the Trinity (New Advent)