Fathers

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What the Fathers say

Isaiah 48:17

Eastern Fathers

Cyril of Alexandria

He says, "I AM your God." This "I AM" means "I am the beginning." He explained all this to the all-wise Moses saying "I am the one who is." For he as Lord is truly the God of everything. Those things that are brought into being by him are said to be "beings" also and to share in the source of being.… Again he works in them a steadfast thinking and a well-established mind that they can see God to be truly existing in nature. To these he reveals his glory so that they are not carried away by deceitful voices.

Commentary On Isaiah 4:3.48:17-19 ↗

Western Saints

Jerome

Thus says the Lord, your holy Redeemer, the God of Israel: I am the Lord your God, teaching you what is profitable, leading you in the way you should go. Oh, that you had paid attention to my commandments! Then your peace would have been like a river, and your righteousness like the waves of the sea. Your descendants would have been like sand, and the offspring of your womb like its grains; their name would never be cut off or destroyed from before me. …

Commentary on Isaiah ↗

Thomas Aquinas

892. Second, where it says, thus says the Lord, he sets out the reason for their captivity, showing on the part of God, ready help: that teach, against their ignorance, and that govern you in the way, of works, against the weakness of their working: I will give you understanding, and I will instruct you in this way, in which you shall go (Ps 32:8). 895. …

Commentary on Isaiah ↗

Bonaventure

The authority of the one commanding ought to move us to observe the commandments of God. He is of great authority, because by His wondrous wisdom He governs us. Whence Isaiah says: "I am the Lord, teaching you profitable things, governing you in the way in which you walk. Would that you had heeded my commandments! Your peace would have been as a river."

Collationes de Decem Praeceptis, Collation 1 ↗