Tradition
St. John Chrysostom
Homilies on the Statues
Homily 11
Thanksgiving to God for deliverance from the evils expected owing to the sedition; and recollection of the events which took place at the time. Also against those who find fault with the structure of the human body, and in general concerning the creation of man; and, in conclusion, on success in avoiding oaths.
Source: Homilies on the Statues (New Advent)