John Chrysostom
The king commands him to speak, greatly desiring to hear him. Then Paul begins to speak with boldness and calls himself happy, not from flattery, but because he speaks before a man to whom everything is known. That this is precisely the reason, listen to what he says next.
If he had been conscious of anything against himself, he would surely have become afraid when coming to trial before a man to whom everything was known. But his conscience is clean. Therefore he does not refuse to appear before a judge who knows the case well. Rather, he rejoices and considers himself happy.
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See how they, the Jews, become involuntary heralds both of their own malice and of Paul's virtue, and this before the king himself. Now Paul was going to Rome more glorious than if he had been free from chains. After so many judges had recognized his innocence, he was no longer going as a deceiver and sorcerer.
He said this not because he sought to flatter him. Far from it! He wished to receive benefit from his courtesy, and in some measure he received it. The one who until then was considered condemned conquered the judge. The captive himself testifies to the victory with noble words, saying before the whole assembly, "You almost persuade me to become a Christian"; Acts 26:28.