"It was not to save a nation that Abraham went to sacrifice Isaac, nor to appease angry gods... Then why does Abraham do it? For God's sake... He does it for the sake of God because God demands proof of his faith... He was not justified by being virtuous, but by being an individual submitted to God in faith."

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...we know that God arranges the opportunities for salvation in different ways. Our situation is that we respond eagerly or in a laggardly manner to these opportunities made available by God to us. God made the call come out of your homeland; Abraham by coming out was exercising obedience. There was the instruction come into the land; it was done, and that was the work of obedience. But the addition which I shall show you has to do with the grace of God, who gave a command - and a promise.

— John Cassian