Fathers

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What the Fathers say

Isaiah 48:18

Western Saints

Ambrose of Milan

Set before yourself any river. It springs from its fountain but is of one nature, of one brightness and beauty. And you assert rightly that the Holy Spirit is of one substance, brightness and glory with the Son of God and with God the Father. I will sum up everything in the oneness of the qualities without any dispute over degrees of greatness. For in this point also Scripture has provided for us. …

On the Holy Spirit 1.16.180-81 ↗

Thomas Aquinas

He also shows the harm from the fault of the Jews: O that you had hearkened to my commandments, keeping them; as a river, abounding, as the waves, the same: if my people had heard me: if Israel had walked in my ways: I should soon have humbled their enemies, and laid my hand on them that troubled them (Ps 81:13-14).

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 ↗