John Chrysostom
What do these proud men say? "We are Abraham's seed and have never been slaves to anyone." At once their thought fell, and this happened because they were exceedingly attached to worldly things.
What, then, do they say? "We are Abraham's seed and have never been slaves to anyone." Yet if they had to be indignant, it would more justly have been over what He said before: "You shall know the truth."
They should have said: What then? Do we not know the truth now? Does this mean that the law and our knowledge are false? But they cared for none of this. They are troubled about worldly matters, supposing slavery of this kind.
Indeed there are now many such people. They are ashamed of indifferent things and of this kind of slavery, but they are not ashamed of slavery to sin.
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They would rather be called slaves a thousand times in the former respect than once in the latter. Such too were the Jews. They knew no other slavery, and therefore they say: You called slaves men descended from Abraham's race.
You called slaves noble men, who for this very reason ought not to be called slaves. We, they say, have never been slaves. See what the Jews vaunt! We are "Abraham's seed," we are Israelites. They never mention their own deeds.
Therefore John cried out to them, saying: "Do not think to say within yourselves, 'We have Abraham as our father,'" Mt 3:9.
But why did Christ not expose them? For they had often been in slavery, to the Egyptians, to the Babylonians, and to many others. Because He did not speak in order to contend with them, but for their salvation and benefit.
This is what He cared about. He could certainly have spoken of four hundred years of slavery. He could have spoken of seventy years. He could have spoken of slavery in the time of the judges, sometimes for twenty years, sometimes for two, sometimes for seven.
He could have said that they had never ceased being slaves.