But if those who declare that Christ has only one nature should say also that that nature is a simple one, they must admit either that He is God pure and simple, and thus reduce the incarnation to a mere pretence, or that He is only man, according to Nestorius. And how then about His being “perfect in divinity and perfect in humanity”? And when can Christ be said to be of two natures, if they hold that He is of one composite nature after the union? For it is surely clear to every one that before the union Christ’s nature was one.