discretio. Igitur qui adsumi manente persona non potuit, iure non uidebitur per Christi generationem potuisse saluari. Non est igitur per generationem Christi hominum saluata natura,--quod credi nefas est. Sed quamquam permulta sint quae hunc sensum inpugnare ualeant atque perfringere, de argumentorum copia tamen haec interim libasse sufficiat. [64] quae _codd._ [65] possit _Vallinus_. IV. You must consider that all I have said so far has been for the purpose of marking the difference between Nature and Person, that is, [Greek: ousia] and [Greek: hupostasis]. The exact terms which should be applied in each case must be left to the decision of ecclesiastical usage. For the time being let that distinction between Nature and Person hold which I have affirmed, viz. that Nature is the specific property of any substance, and Person the individual substance of a rational nature. Nestorius affirmed that in Christ Person was twofold, being led astray by the false notion that Person may be applied to every nature. For on this assumption, understanding that there were in Christ two natures, he declared that there were likewise two persons. And although the definition which we have already given is enough to prove Nestorius wrong, his error shall be further declared by the following argument. If the Person of Christ is not single, and if it is clear that there are in Him two natures, to wit, divine and human (and no one will be so foolish as to fail to include either in the definition), it follows that there must apparently be two persons; for Person, as has been said, is the individual substance of a rational nature.