Mark 6:23

(ubi sup.) His oath does not excuse his murder, for perchance his reason for swearing was, that he might find an opportunity for slaying, and if she had demanded the death of his father and mother, he surely would not have granted it. It goes on, And she went forth, and said unto her mother, What shall I ask? And she said, The head of John the Baptist. Worthy is blood to be asked as the reward of such a deed as dancing. It goes on, And she came in straightway with haste, &c.

(Mor. 3, 7) I cannot, without the greatest wonder, reflect that he, who was filled even in his mother's womb with the spirit of prophecy, and who was the greatest that had arisen amongst those born of women, is sent into prison by wicked men, is beheaded for the dancing of a girl, and though a man of so great austerity, meets death through such a foul instrument. Are we to suppose that there was something evil in his life, to be wiped away by so ignominious a death? When, however, could he commit a sin even in his eating, whose food was only locusts and wild honey? How could he offend in his conversation, who never quitted the wilderness? How is it that Almighty God so despises in this life those whom He has so sublimely chosen before all ages, if it be not for the reason, which is plain to the piety of the faithful, that He thus sinks them into the lowest place, because He sees how He is rewarding them in the highest, and outwardly He throws them down amongst things despised, because inwardly He draws them up even to incomprehensible things. Let each then infer from this what they shall suffer, whom He rejects, if He so grieves those whom he loves.

For during the banquet, Satan danced in the person of the damsel, and the wicked oath is completed. For it goes on, And he sware unto her, Whatsoever thou shalt ask of me, I will give it thee, unto the half of my kingdom.