Assertio vera de Trinitate, contra quorundam deliramenta quae ex Serveti aliorumque phanaticorum hominum opinionibus nunc primum in quibusdam Hungariae partibus exorta ac publicata sunt

...However, as a thing is estimated not from the words by which it is uttered, but from the right itself and the thing itself which it is: so indeed any pious person will estimate this matter not from the words, but from the thing itself and the truth, in whatever words it may finally be expressed.

The name of Person was born from the distinct words of the Father, the Son, and the Holy Spirit. For to what purpose do these distinct words pertain, if the Father, Son, and Holy Spirit do not truly subsist in one essence? The most ancient Fathers, even if they do not make mention of the word Person, yet they remember a nature subsisting by itself in the λόγῳ Logos/Word. As can be seen in Tertullian, Irenaeus, and Origen. For a nature subsisting by itself and person are the same. And indeed, we know that the name of Person extends widely, such that even a man can be called this, since it only differs between God and man: yet a special name suitable for declaring this thing is not found. The Greeks call it hypostasis, others ἰδιότητα idiotēs/distinctive property.

Regarding the name of Person, see Augustine, book 7, chapter 4, On the Trinity. And in sermon 189, On the Trinity, he says: "Whenever I call them persons, I ask you not to think that I mean the persons of men. I say persons in the Father and