Library Eusebius of Caesarea Life of Constantine
Book 2, Chapter 65: His Continual Anxiety for Peace.
My design then was, first, to bring the diverse judgments formed by all nations respecting the Deity to a condition, as it were, of settled uniformity; and, secondly, to restore to health the system of the world, then suffering under the malignant power of a grievous distemper. Keeping these objects in view, I sought to accomplish the one by the secret eye of thought, while the other I tried to rectify by the power of military authority. For I was aware that, if I should succeed in establishing, according to my hopes, a common harmony of sentiment among all the servants of God, the general course of affairs would also experience a change correspondent to the pious desires of them all.
English translation by Ernest Cushing Richardson, in Nicene and Post-Nicene Fathers, Series II, Vol. I (eds. Philip Schaff and Henry Wace; Buffalo: Christian Literature Publishing Co., 1890). Public domain. Digital text via New Advent Church Fathers.