Council of Toledo XI, 675

as the Son, the Son the same as the Father, the Holy Spirit the same as the Father and the Son, it is plain that the reference is to the nature or substance by which He is God, because in substance they are one; for we are distinguishing persons, we are not dividing the Deity.—

281. We acknowledge, therefore, the Trinity in a distinction of persons; we profess unity on account of the nature or substance. Therefore, the three are one, that is, in nature, not in person. We must not, however, consider these three persons separable, since we believe that no one before the other, no one after the other, no one without the other ever existed or did anything. For, they are found inseparable both in that which they are, and in that which they do, because between the generating Father and the generated Son and the proceeding Holy Spirit we believe that there was no interval of time in which either the begetter at any time preceded the begotten, or the begotten was lacking to the begetter, or the proceeding Holy Spirit appeared after the Father or the Son. Therefore, for this reason we proclaim and believe that this Trinity is inseparable and unconfused. These three, therefore, are called persons, as our ancestors define, that they may be recognized, not that they may be separated. For, if we give attention to that which Holy Scripture says of Wisdom: “She is the brightness of eternal light” [Wisd. 7:26], as we see the splendor inhering inseparably in light, so we confess that the Son cannot be separated from the Father. Therefore, just as we do not confuse these three persons of one and inseparable nature, so do we in nowise declare them separable. Since, indeed, the Trinity itself has so deigned to show this clearly to us that even in these names by which it wished the persons to be recognized singly, it does not permit one to be understood without the other; for neither is the Father recognized without the Son, nor is the Son found without the Father. Indeed, the very relation of personal designation forbids the persons to be separated, whom, even when it does not name them together, it implies together. Moreover, no one can hear anyone of those names without being constrained to think also of another. Since, then, these three are one and the one three, there is yet remaining to each person His own property. For the Father has eternity without nativity, the Son eternity with nativity, and the Holy Spirit procession without nativity with eternity.

282. [The Incarnation] Of these three persons we believe that for the liberation of the human race only the person of the Son became true man without sin from the holy and immaculate Virgin Mary, from whom He is begotten in a new manner and by a new birth; in a new manner, because invisible in divinity, He became visible in flesh; by a new birth, however, is He begotten, because inviolate virginity without the experience of sexual intercourse supplied the material of human flesh made fruitful by the Holy Spirit. This Virgin birth is neither grasped