XIV. Effect of the union: communion of natures and communication of idioms
XIV. The effect of the personal union is the communion both of the natures and of the properties, which is called the communication of idioms. On account of it they are predicated of one another — not absolutely and abstractly, but through concrete words that involve the supposit and connote the personality in which the natures agree. For the reason why one nature is predicated of the other is none other than the hypostatic union in the same supposit.
Therefore it is unlawful to say absolutely that God suffered, or that a human created heaven; but through concretes one is rightly declared of the other, and the property and operation of the one of the other — as God is human, the human is God, God suffered and died, the human is eternal and made heaven and earth. Damascene calls this an exchange of names, and Melanchthon defines the predication in which a property belonging to one nature is attributed to the person in the concrete. For just as the unity of person and the personal union, so also the distinction of the two natures in Christ is necessarily retained. And because the idioms of both natures are attributed indifferently to the person signified by concrete words, therefore on account of the difference of natures it is sometimes usual to add according to which nature the predicate belongs to the subject.
CHAPTER THREE follows, On the offices of Jesus Christ.
Latin
XIV. Effectus unionis personalis est communio tum naturarum, tum proprietatum, quae dicitur communicatio idiomatum. Propter quam de se invicem praedicantur, non quidem absolute & abstracte, sed per vocabula concreta quae involvunt suppositum, & connotant personalitatem, in qua naturae conveniunt. Nam ratio, propter quam una natura de altera praedicatur, nulla est alia, quam unio hypostatica in eodem supposito. Quapropter nefas est dicere absolute Deum esse passum, aut hominem creasse caelum; sed per concreta recte unum de altero, & proprietas atque operatio alterius de altero enunciabitur, ut Deus est homo, homo est Deus, Deus est passus & mortuus, homo est aeternus, condidit caelum & terram. Damascenus appellat antidosis onomaton, & Melanchthon finit praedicationem, in qua proprietas uni naturae conveniens tribuitur personae in concreto. Ut enim unitas personae & unio personalis, ita & duarum naturarum in Christo distinctio necessario retinetur. Quia vero personae per vocabula concreta significatae utriusque naturae idiomata indifferenter tribuuntur, idcirco propter discrimen naturarum, ut sciatur secundum utram naturam praedicatum subiecto conveniat, addi id ipsum nonnunquam solet. CAPUT TERTIUM sequitur, De officiis Iesu Christi.