Episode Details

Here is the text from Aquinas we read today:

"And in Jesus Christ, His only Son, our Lord."

It is not only necessary for Christians to believe in one God who is the Creator of heaven and earth and of all things; but also they must believe that God is the Father and that Christ is the true Son of God. This, as St. Peter says, is not mere fable, but is certain and proved by the word of God on the Mount of Transfiguration. "For we have not by following artificial fables made known to you the power and presence of our Lord Jesus Christ; but we were eyewitnesses of His greatness. For He received from God the Father honor and glory, this voice coming down to Him from the excellent glory: 'This is My beloved Son, in whom I am well pleased. Listen to Him.' And this voice, we heard brought from heaven, when we were with Him in the holy mount" [2 Pet 1:16]. Christ Jesus Himself in many places called God His Father, and Himself the Son of God. Both the Apostles and the Fathers placed in the articles of faith that Christ is the Son of God by saying: "And (I believe) in Jesus Christ, His (i.e., God's) only Son".

Errors

There were, however, certain heretics who erred in this belief. Photinus, for instance, believed that Christ is not the Son of God but a good man who, by a good life and by doing the will of God, merited to be called the son of God by adoption; and so Christ who lived a good life and did the will of God merited to be called the son of God. Moreover, this error would not have Christ living before the Blessed Virgin, but would have Him begin to exist only at His conception. Accordingly, there are here two errors: the first, that Christ is not the true Son of God according to His nature; and the second, that Christ in His entire being began to exist in time. Our faith, however, holds that He is the Son of God in His nature, and that he is from all eternity. Now, we have definite authority against these errors in the Holy Scriptures, Against the first error it is said that Christ is not only the Son, but also the only-begotten Son of the Father: "The only begotten Son who is in the bosom of the Father, He has declared Him:" [Jn 1:18]. And again the second error it is said: "Before Abraham was made, I AM" [Jn 8:58]. It is evident that Abraham lived before the Blessed Virgin. And what the Fathers added to the other [Nicene] Creed, namely, "the only-begotten Son of God," is against the first error; and "born of the Father before all ages" is against the second error.

Sabellius said that Christ indeed was before the Blessed Virgin, but he held that the Father Himself became incarnate and, therefore, the Father and the Son is the same Person. This is an error because it takes away the Trinity of Persons in God, and against it is this authority: "I am not alone, but I and the Father who sent Me" [Jn 8:16]. It is clear that one cannot be sent from himself. Sabellius errs therefore, and in the [Nicene] Creed of the Fathers it is said: "God of God; Light of Light," that is, we are to believe in God the Son from God the Father, and the Son who is Light from the Father who is Light.

Arius, although he would say that Christ was before the Blessed Virgin and that the Person of the Father is other than the Person of the Son, nevertheless made a three-fold attribution to Christ: (1) that the Son of God was a creature; (2) that He is not from eternity, but was formed the noblest of all creatures in time by God; (3) that God the Son is not of one nature with God the Father, and therefore that He was not true God. But this too is erroneous and contrary to the teaching of the Holy Scriptures. It is written: "I and the Father are one" [Jn 10:30]. That is, in nature; and therefore, just as the Father always existed, so also the Son; and just as the Father is true God, so also is the Son. That Christ is a creature, as said by Arius, is contradicted in the "Symbol" by the Fathers: "True God of true God