John Chrysostom
Even after the authorities had announced it, Paul does not leave, perhaps for the sake of Lydia and the other brethren. Or he wished to frighten the authorities, so that no one would think they had been released at their own request, and to instill courage in the other Christians. Beloved, their guilt was threefold. They had imprisoned Roman citizens, without trial, and publicly. Do you see how the apostles did many things in a human way? “They beat us publicly without trial and threw us into prison.” This was so that the matter would not be only an action of grace, but also their own. They do not say, “They beat and imprisoned men who performed miracles,” for the authorities would not have heeded this. Rather, they say what could especially affect their souls: “us, Roman citizens, publicly and without trial.”