[De articulis fidei]

...that one person is sometimes called the Father, sometimes the Son, sometimes the Holy Spirit. The second is the error of Arius, who posited three persons but denied the unity of the essence, saying the Son is of a different substance from the Father and is a creature, and less than the Father, not coequal or coeternal, but that He began after He had not been. And against these two errors, the Lord says in John 10: "I and the Father are one." For as Augustine says, in the fact that He says "one," He frees you from Arius, and in that He says "are," which is plural, He frees you from Sabellius. The third is the error of Eunomius, who posited the Son as dissimilar to the Father, against whom it is said in Colossians 1: "Who is the image of the invisible God." The fourth is the error of Macedonius, who posited that the Holy Spirit is a creature. Against whom it is said in 2 Corinthians 3: "Now the Lord is the Spirit." The fifth is the error of the Greeks, who say the Holy Spirit proceeds from the Father and not from the Son. Against whom it is said in John 14: "But the Paraclitus Advocate/Holy Spirit, whom the Father will send in my name," because according to Him, the Father sends Him as the Spirit of the Son and as proceeding from the Son. And in John 16 it is said: "He shall glorify me, for he shall receive of mine." And against all these errors, it is said in the symbolum creed: "I believe in God the Father Almighty, and in His only-begotten Son, not made, consubstantial with the Father, and in the Holy Spirit, the Lord and Giver of Life, who proceeds from the Father and the Son."

The other four articles of divinity pertain to the effect of divine power.

Of which the first, and the third, pertain to the creation of things in the being of nature, according to that which is said: "He spoke, and they were created." Against this article: First, Democritus and Epicurus erred, positing that neither the matter of the world nor the composition of the world itself was from God, but that the world was made by chance through the collision of invisible bodies which they considered to be the principles of things.