Adam Clarke on Acts 25:18

They brought none accusation of such things as I supposed - It was natural for Festus, at the first view of things, to suppose that Paul must be guilty of some very atrocious crime. When he found that he had been twice snatched from the hands of the Jews; that he had been brought to Caesarea, as a prisoner, two years before; that he had been tried once before the Sanhedrin, and once before the governor of the province; that he had now lain two years in bonds; and that the high priest and all the heads of the Jewish nation had united in accusing him, and whose condemnation they loudly demanded; when, I say, he considered all this, it was natural for him to suppose the apostle to be some flagitious wretch; but when he had tried the case, and heard their accusations and his defense, how surprised was he to find that scarcely any thing that amounted to a crime was laid to his charge; and that nothing that was laid to his charge could be proved!