Matthew 14:9 - Ellicott's Commentary On The Whole Bible

The king was sorry. — It was the last struggle of conscience. In that moment there must have come before his mind his past reverence for the prophet, the joy which had for a time accompanied the strivings of a better life, possibly the counsels of his foster-brother Manaen. Had there been only the personal influence of Herodias these might have prevailed against it, but, like most weak men, Herod feared to be thought weak. It was not so much his regard for the oath which he had taken (that, had it been taken in secret, he might have got over), but his shrinking from the taunt, or whispered jest, or contemptuous gesture of the assembled guests, if they should see him draw back from his plighted word. A false regard for public opinion, for what people will say or think of us in our own narrow circle, was in this, as in so many other instances, an incentive to guilt instead of a restraint.