Letter 31

Ambrose of MilanHorontianus|c. 385 AD|ambrose milan
From: Ambrose, Bishop of Milan
To: Horontianus
Date: ~378 AD
Context: Continuing the Genesis series, Ambrose discusses Abraham's faith as a model for the Christian life, drawing moral and allegorical lessons from the patriarch's journey.

Ambrose to Horontianus — greetings.

Abraham is the father of faith, and his story is our story. When God called him to leave Ur of the Chaldeans and go to a land he had never seen (Genesis 12:1), Abraham obeyed — and that obedience is the template for every Christian life.

Faith is not a feeling; it is a departure. It means leaving behind what is familiar and trusting a promise you cannot yet verify. Abraham did not know where he was going. He only knew who was calling. That was enough.

Notice the progression: God promised Abraham descendants as numerous as the stars (Genesis 15:5), yet Abraham's wife Sarah was barren. The promise contradicted the evidence. This is always the shape of faith — it trusts the word of God against the testimony of circumstances. The man who believes only what he can see has no need of faith and no capacity for it.

Then came the supreme test: the sacrifice of Isaac (Genesis 22). God asked Abraham to surrender the very son through whom the promise was to be fulfilled. The contradiction was absolute. If Isaac dies, the promise dies with him. Yet Abraham obeyed, because he had learned that God's faithfulness does not depend on human comprehension.

He did not understand; he obeyed. He did not calculate; he trusted. And God provided the ram — not because Abraham's obedience earned it, but because God's purpose could not be defeated even by the most extreme test.

This is the faith we are called to, brother: not the comfortable belief of those who have never been tested, but the costly trust of those who obey in the dark.

Farewell.

Modern English rendering for readability. See the 19th-century translation or original Latin/Greek for scholarly use.

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