17 O. When Constantius was on the throne and Eusebius and Hypatius were Consuls, there was composed, under the pretext of unity and faith, an unfaithful creed, as it is now acknowledged to have been. For at that time, nothing seemed so characteristic of piety, nothing so befitting a servant of God, as to follow after unity, and to shun separation from communion with the rest of the world. And all the more because the current profession of faith no longer exhibited on the face of it anything profane.
“We believe,” said they, “in one true God, the Father Almighty. This we also confess: We believe in the only begotten Son of God, who, before all worlds, and before all their origins, was born of God. The only-begotten Son, moreover, we believe to be born alone of the Father alone, God of God, like to his Father who begot Him, according to the Scriptures; whose birth no one knows, but the Father alone who begot Him.” Do we find any such words inserted here as “There was a time, when he was not?”
Or, “The Son of God is a creature though not made of things which exist.” No. This is surely the perfection of faith to say we believe Him to be God of God. Moreover, they called Him the only begotten, “born alone of the Father.” What is the meaning of born? Surely, not made. His birth removed all suspicion of His being a creature. They added further, “Who came down from heaven, was conceived of the Holy Ghost, born of the Virgin Mary, crucified by Pontius Pilate, rose again the third day from the dead, ascended into heaven, sits at the right hand of the Father, who will come to judge the quick and the dead.” There was the ring of piety in the words, and no one thought that poison was mingled with the honey of such a proclamation.
Source: The Dialogue Against the Luciferians (New Advent)