Christ is other than God. This faith I held together with my fellow apostles: this I delivered to the Churches: this I preached to the Gentiles: this I proclaim to thee also, Christ is God, Christ is God. A sound mind imagines nothing else: a sound faith says nothing else. The Deity cannot be parted from Itself. And since whatever is Christ is God, there can be found in God none other but God.”
Complete source paragraph · Against Nestorius, Chapter XV.; original source section: Chapter 15; original book/conference: Book III., source paragraph 4 · Original source