“Hear, O Israel, the LORD our God is one LORD …”1. “The supreme being must be unique, without equal…. If God is not one, he is not God.”2
Faith in God leads us to turn to him alone as our first origin and our ultimate goal, and neither to prefer anything to him nor to substitute anything for him.
Dt 6:4; Mk 12:29.
Tertullian, Adv. Marc., 1, 3, 5: PL 2, 274.
St. Augustine, Sermo 52, 6, 16: PL 38, 360 and Sermo 117, 3, 5: PL 38, 663.
Ex 34:6.