1 God, therefore, is one and the same, who rolls up the heaven as a book, and renews the face of the earth; who made the things of time for man, so that coming to maturity in them, he may produce the fruit of immortality; and who, through His kindness, also bestows [upon him] eternal things, “that in the ages to come He may show the exceeding riches of His grace;” who was announced by the law and the prophets, whom Christ confessed as His Father. Now He is the Creator, and He it is who is God over all, as Esaias says, “I am witness, says the Lord God, and my servant whom I have chosen, that you may know, and believe, and understand that I am.
Before me there was no other God, neither shall be after me. I am God, and besides me there is no Saviour. I have proclaimed, and I have saved.” And again: “I myself am the first God, and I am above things to come.” For neither in an ambiguous, nor arrogant, nor boastful manner, does He say these things; but since it was impossible, without God, to come to a knowledge of God, He teaches men, through His Word, to know God. To those, therefore, who are ignorant of these matters, and on this account imagine that they have discovered another Father, justly does one say, “You do err, not knowing the Scriptures, nor the power of God.”
Source: Adversus haereses (New Advent)