CCC 228
Profession of Faith›SECTION TWO I. THE CREEDS›CHAPTER ONE I BELIEVE IN GOD THE FATHER›Paragraph 1. I BELIEVE IN GOD
"Hear, O Israel, the LORD our God is one LORD..." ( Dt 6:4; Mk 12:29). "The supreme being must be unique, without equal. . . If God is not one, he is not God" (Tertullian, Adv. Marc., 1, 3, 5: PL 2, 274).