For the two natures were united with each other without change or alteration, neither the divine nature departing from its native simplicity, nor yet the human being either changed into the nature of God or reduced to non-existence, nor one compound nature being produced out of the two. For the compound nature Cf. Eulogius and also Polemon in the Collect. Contr. Severianos. cannot be of the same essence as either of the natures out of which it is compounded, as made one thing out of others: for example, the body is composed of the four elements, but is not of the same essence as fire or air, or water or earth, nor does it keep these names. If, therefore, after the union, Christ’s nature was, as the heretics hold, a compound unity, He had changed from a simple into a compound nature Max. Epist. ad Joan. cubic. p. 279., and is not of the same essence as the Father Whose nature is simple, nor as the mother, who is not a compound of divinity and humanity. Nor will He then be in divinity and humanity: nor will He be called either God or Man, but simply Christ: and the word Christ will be the name not of the subsistence, but of what in their view is the one nature.