John Chrysostom
See how many years beforehand this promise was given, and what the form of the promise was, when there was neither sacrifice nor circumcision.
Here Stephen shows that God Himself permitted the Jews to suffer, and that their enemies would not remain unpunished.
“They shall be in bondage and affliction. I will judge them, said God.” Do you see? He Who promised and gave the land first permits calamities.
So it is now. Having promised the Kingdom, He permits us to undergo temptations. If freedom came there after four hundred years, what wonder is it if the same is true of the Kingdom?
It was then that they should have said that God is wise and mighty, able to bring us out from there.
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The wisdom of God was especially revealed in this: even amid persecutions the people multiplied, though enslaved, afflicted, and slain.
So great is the power of the promise. If they had multiplied in their own land, it would not have been so wondrous. Nor was it a short time that they lived in a foreign land, but four hundred years.