God Is True

For the word of the LORD is upright, and all His work is done in faithfulness.
PSALM 33:4
God Is True
The fact that He promised us the Son was the sheer mercy of God. And so He Himself, in His coming, is Mercy, that is, the result of God's mercy that He promised. But the fact that God sent Him was the truth and faithfulness of God. And so He is Himself the Truth, that is, the realization of the truth of God offering the promise. Therefore what God the Father promised was Mercy; and what He sent was Truth. And so they are wonderfully mingled and brought together. The fact that God is true in the things promised is His mercy, not our merit. But the fact that He has mercy is His truth. And so, when He has mercy, He becomes true [that is, He keeps faith and promise], and when He keeps faith or remains true, He has mercy. And both are in Christ.

From First Lectures on the Psalms (Luther's Works 11:165)
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