St Augustine teaches, “Whoever thinks he understands the Holy Scriptures, or any part of them, but interprets them in a way that does not build up this two-fold Love of God and love of neighbor, does not truly understand the Scriptures. If, on the other hand, a man draws a meaning from Scriptures that builds up the two-fold Love of God and love of his neighbor, although he does not precisely understand the exact meaning of the author, his error is not pernicious, and he is wholly clear from the charge of deception.” […]
This discourse on the Apostle’s Creed was delivered by St Augustine to a local church council in North Africa. In this treatise he repeats his classical explanation of the Trinity:
The Father is truly God, the Son is truly God, and the Holy Spirit is truly God.
The Father is not sometimes the Son, and the Father is not sometimes the Holy Spirit, and God is One. We have God the Father, God the Son, and God the Holy Spirit, but “there are not three Gods in that Trinity, but One God and one substance.” […]