John Chrysostom
Notice the elevation and expressiveness of these words. He did not say 'we listened' in word, but 'we yielded' in submission, because they were not doing this in order to teach anything useful, but to subject and enslave them.
'Therefore,' he says, 'we yielded to the Apostles, but not to those men.'
'...that the truth of the Gospel might remain with you.' He says: so that we might confirm by deeds what we taught by words, namely that the old things have passed away and all things have become new.
He means that 'if anyone is in Christ, he is a new creation,' 2 Cor 5:17, and that Christ will profit nothing to those who are circumcised, Gal 5:2 and Gal 6:15.
Affirming this truth, we did not yield to them for even an hour.
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But since the conduct of the Apostles was immediately spoken against him, some naturally could say: how, then, do they command this?
See how wisely he resolves this objection. He does not indicate the true reason, namely that the Apostles did this by condescension and for a special purpose, because this might have harmed the hearers.
Those who are to receive some benefit from an action do not need to know the cause of the action. If the reason for what is done becomes known, everything collapses.
Therefore only the one who acts should know the reason for the action. Those for whom benefit is being prepared through it should not know this reason.
To make clearer what I am saying, I will give an example from this very matter. This blessed Paul himself abolished circumcision. Yet when he wished to send Timothy as a teacher to the Jews, he first circumcised him and then sent him, Acts 16:3.
He did this so that the hearers would have greater trust in Timothy. Timothy came to them circumcised in order to abolish circumcision.
Paul himself, and Timothy also, knew the reason for this action, but he did not tell the disciples.
Indeed, if they had learned that he was circumcised in order to abolish circumcision, they would not have listened to his preaching at all, and all the benefit would have perished.
As it was, their ignorance brought them the greatest benefit. Thinking, of course, that he had done this as a keeper of the law, they received him and his teaching favorably and readily.
Receiving his teaching little by little and being confirmed in it, they abandoned the old things. This would not have happened if they had known the reason at the beginning.
Indeed, if they had learned this, they would have turned away from him. Turning away, they would not have listened. Not listening, they would have remained in their former error.
So that this would not happen, he did not reveal the reason. This is why here also he does not reveal the reason for such action, but leads his discourse by another path, speaking thus: