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This is an instance of the communicatio idiomatum. The properties of the two natures act and react upon one another. But we must make the distinction of natures our starting-point, or fusion will take place. There must be idiomata first, or the communicatio is meaningless. The view taken of the Christ of the past necessarily affects belief in the Christ of the present.

The famous addition to the Trisagion, "who wast crucified for us," which for a time won recognition as sound and catholic, was first made by the monophysite Bishop of Antioch. Both these phrases have scriptural authority, and they are justified by the communicatio idiomatum. But they are liable to misuse and misinterpretation. All depended on how they were said and who said them.

The monophysite confounds the natures, and so he has no right to appeal to the communicatio idiomatum. Unless the idiomata are admitted as such, unless they are preserved in their distinctness, there can be no communicatio between them. If they are fused, they cannot act and react upon each other.

Theologians talk of a communicatio idiomatum as between the human and the divine elements in Christ. There is an analogous passage of the attributes of either to the other, in the relation of the believer to his Saviour.