Who, then, is so wicked and faithless, who is so insane with the madness of discord, that either he should believe that the unity of God can be divided, or should dare to rend it--the garment of the Lord--the Church of Christ? He Himself in His Gospel warns us, and teaches, saying, "And there shall be one flock and one shepherd." And does any one believe that in one place there can be either many shepherds or many flocks? ... Do you think you can stand and live if you withdraw from the Church, building for yourself other homes and a different dwelling?
Treatise I: On the Unity of the Church