1 Therefore neither would the Lord, nor the Holy Spirit, nor the apostles, have ever named as God, definitely and absolutely, him who was not God, unless he were truly God; nor would they have named any one in his own person Lord, except God the Father ruling over all, and His Son who has received dominion from His Father over all creation, as this passage has it: “The Lord said unto my Lord, Sit at my right hand, until I make Your enemies Your footstool.” Here the [Scripture] represents to us the Father addressing the Son; He who gave Him the inheritance of the heathen, and subjected to Him all His enemies.
Since, therefore, the Father is truly Lord, and the Son truly Lord, the Holy Spirit has fitly designated them by the title of Lord. And again, referring to the destruction of the Sodomites, the Scripture says, “Then the Lord rained upon Sodom and upon Gomorrha fire and brimstone from the Lord out of heaven.” For it here points out that the Son, who had also been talking with Abraham, had received power to judge the Sodomites for their wickedness. And this [text following] does declare the same truth: “Your throne, O God, is for ever and ever; the sceptre of Your kingdom is a right sceptre.
You have loved righteousness, and hated iniquity: therefore God, Your God, has anointed You.” For the Spirit designates both [of them] by the name, of God— both Him who is anointed as Son, and Him who does anoint, that is, the Father. And again: “God stood in the congregation of the gods, He judges among the gods.” He [here] refers to the Father and the Son, and those who have received the adoption; but these are the Church. For she is the synagogue of God, which God— that is, the Son Himself— has gathered by Himself.
Of whom He again speaks: “The God of gods, the Lord has spoken, and has called the earth.” Who is meant by God? He of whom He has said, “God shall come openly, our God, and shall not keep silence;” that is, the Son, who came manifested to men who said, “I have openly appeared to those who seek Me not.” But of what gods [does he speak]? [Of those] to whom He says, “I have said, You are gods, and all sons of the Most High.” To those, no doubt, who have received the grace of the “adoption, by which we cry, Abba Father.”
Source: Adversus haereses (New Advent)