Nicene and Post-Nicene Fathers, Ser. II, Vol I:
The Life of Constantine with Orations of Constantine and Eusebius.: Chapter XVII

Chapter XVII.—Constantine’s Letter to the Churches respecting the Council at Nicæa.

“Constantinus Augustus, to the Churches.

“Having had full proof, in the general prosperity of the empire, how great the favor of God has been towards us, I have judged that it ought to be the first object of my endeavors, that unity of faith, sincerity of love, and community of feeling in regard to the worship of Almighty God, might be preserved among the highly favored multitude who compose the Catholic Church. And, inasmuch as this object could not be effectually and certainly secured, unless all, or at least the greater number of the bishops were to meet together, and a discussion of all particulars relating to our most holy religion to take place; for this reason as numerous an assembly as possible has been convened, at which I myself was present, as one among yourselves (and far be it from me to deny that which is my greatest joy, that I am your fellow-servant), and every question received due and full examination, until that judgment which God, who sees all things, could approve, and which tended to unity and concord, was brought to light, so that no room was left for further discussion or controversy in relation to the faith.