Library Eusebius of Caesarea Life of Constantine
Book 2, Chapter 70: An Exhortation to Unanimity.
Let therefore both the unguarded question and the inconsiderate answer receive your mutual forgiveness. For the cause of your difference has not been any of the leading doctrines or precepts of the Divine law, nor has any new heresy respecting the worship of God arisen among you. You are in truth of one and the same judgment: you may therefore well join in communion and fellowship.
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.