25. Behold, then, why the Son of God was sent; nay, rather behold what it is for the Son of God to be sent. Whatever things they were which were wrought in time, with a view to produce faith, whereby we might be cleansed so as to contemplate truth, in things that have a beginning, which have been put forth from eternity, and are referred back to eternity: these were either testimonies of this mission, or they were the mission itself of the Son of God. But some of these testimonies announced Him beforehand as to come, some testified that He had come already. For that He was made a creature by whom the whole creation was made, must needs find a witness in the whole creation. For except one were preached by the sending of many [witnesses] one would not be bound to, the sending away of many. And unless there were such testimonies as should seem to be great to those who are lowly, it would not be believed, that He being great should make men great, who as lowly was sent to the lowly. For the heaven and the earth and all things in them are incomparably greater works of the Son of God, since all things were made by Him, than the signs and the portents which broke forth in testimony of Him. But yet men, in order that, being lowly, they might believe these great things to have been wrought by Him, trembled at those lowly things, as if they had been great.
Complete source paragraph · On the Holy Trinity, Chapter 19.—In What Manner the Son Was Sent and Proclaimed Beforehand. How in the Sending of His Birth in the Flesh He Was Made Less Without Detriment to His Equality with the Father.; original source section: Chapter 20, source paragraph 2 · Original source