Mark 6:26

26.And the king being sorry. His heart, as we have said, was no longer influenced by religious sentiments; but, foreseeing the detestation that will be excited by such a crime, he dreads both the loss of character and positive harm, and consequently repents of his levity. And yet he has not the courage to give a refusal to a dancing girl, lest he should incur the reproach of unsteadiness; as if it were more dishonorable to retract a rash and foolish promise than to persist in a heinous crime. With the wonted vanity of kings, he does not choose that what he has once uttered shall be recalled, and orders that the prophet shall be instantly slain. We infer that Herod was at that time supping in the castle of Macherus, where, Josephus tells us, John was imprisoned, (Ant. 18. 5:2.)

On account of the oath, and of those who sat at table with him. It deserves our attention that the Evangelists state this to be the reason of his grief; and hence we infer that, though he had sworn a hundred times, yet if there had been no witness, he would not have held by his oath. No inward feelings of religion constrained Herod to do this, but the mere love of power drove him headlong; for he reckoned that he would sink in the estimation of those who were present, if he did not fulfill his engagement. Thus it frequently happens that ungodly men fail to perform their duty, because they do not look to God, but are only intent on this object, that they may not incur the reproaches of men. (369) But though Herod had kept before his eyes the sacredness of an oath alone, and not the dread of the opinion of men, he committed a more heinous offense in fulfilling a foolish promise than if he had violated his oath. First, he was deeply in fault for such haste in swearing; for the design of an oath is to confirm a promise in a doubtful matter. Next, when it appeared that he could not be relieved from his engagement without involving himself in an aggravated crime, he had no right to implicate the sacred name of God in such wickedness; for what could be more at variance with the nature of God than to lend his countenance to a shocking murder? If a private loss is at stake, let him who has made a rash oath suffer the punishment of his folly; but, when a man has taken the name of God in vain, let him beware of doubling his guilt by employing this as a pretense for committing some enormous crime. Hence it follows, that monastic vows, which are attended by open impiety, do not bind the conscience any more than the enchantments of magicians; for it is not the will of God that his sacred name shall give support to what is sinful. But this passage teaches us, that we ought to beware of making promises without consideration; and next, that lightness must not be followed by obstinacy.