I am not mad - I am not deranged. There are few more happy turns than what Paul gives to this accusation of Festus. He might have appealed to the course of his argument; he might have dwelt on the importance of the subject, and continued to reason; but he makes an appeal at once to Agrippa, and brings him in for a witness that he was not deranged. This would be far more likely to make an impression on the mind of Festus than anything that Paul could say in self-defense. The same reply, “I am not mad,” can be made by all Christians to the charge of derangement which the world brings against them. They have come, like the prodigal son Luke 15:17, to their right mind; and by beginning to act as if there were a God and Saviour, as if they were to die, as if there were a boundless eternity before them, they are conducting according to the dictates of reason. And as Paul appealed to Agrippa, who was not a Christian, for the reasonableness and soberness of his own views and conduct, so may all Christians appeal to sinners themselves as witnesses that they are acting as immortal beings should act. All people know that if there is an eternity, it is right to prepare for it; if there is a God, it is proper to serve him; if a Saviour died for us, we should love him; if a hell, we should avoid it; if a heaven, we should seek it. And even when they charge us with folly and derangement, we may turn at once upon them, and appeal to their own consciences, and ask them if all our anxieties, and prayers, and efforts, and self-denials are not right? One of the best ways of convicting sinners is to appeal to them just as Paul did to Agrippa. When so appealed to, they will usually acknowledge the force of the appeal, and will admit that the solicitude of Christians for their salvation is according to the dictates of reason.
Most noble Festus - This was the usual title of the Roman governor. Compare Acts 24:3.
Of truth - In accordance with the predictions of Moses and the prophets, and the facts which have occurred in the death and resurrection of the Messiah. In proof of this he appeals to Agrippa, Acts 26:26-27. Truth here stands opposed to delusion, imposture, and fraud.
And soberness - Soberness σωφροσύνη sōphrosunē, wisdom) stands opposed here to madness or derangement, and denotes “sanity of mind.” The words which I speak are those of a sane man, conscious of what he is saying, and impressed with its truth. They were the words, also, of a man who, under the charge of derangement, evinced the most perfect self-possession and command of his feelings, and who uttered sentiments deep, impressive, and worthy the attention of all mankind.