Augustine's definition of the TRINITY -- 5th c. AD

Augustine wrote:

"We believe, we maintain, we faithfully preach, that the Father begat the Word, that is, Wisdom, by which all things were made, the only-begotten Son, one as the Father is one, eternal as the Father is eternal, and, equally with the Father, supremely good; and tha the Holy Spirit is the Spirit alike of Father and of Son, and is Himself consubstantial and co-eternal with both; and that this whole is a Trinity by reason of the individuality of the persons, and one God by reason of the indivisible divine substance, as also one Almighty by reason of the indivisible omnipotence; yet so that, when we inquire regarding each singly, it is said that each is God and Almighty; an, when we speak of all together, it is said that there are not three Gods, nor three Almighties, but one God Almighty; so great is the indivislbe unity of these Three, which requires that it be so stated" (from the City of God, 11.24).