John Chrysostom, on Jas 5:12

“But above all things, my brethren, swear not, neither by heaven, nor by the earth, nor by any other oath. But let your speech be, yea, yea: no, no: that you fall not under judgment.”

“What if someone swears an oath and claims that he was forced to do so? The fear of God is more powerful than any force. For though you may start out by swearing all kinds of promises, you will not keep any of them. Moreover, you would not dare to swear or give an oath in matters of human law, which you accept whether you want to or not. You would certainly never claim that you were forced into doing so. Now the person who has heard the blessings of God and who has prepared himself as Christ has commanded will never claim any need to do anything of the kind, for he is respected and honored by all. What is needed beyond a simple yes and no? An oath adds nothing to these, for no one has to be told that evil is the source of both excess and its deficient opposite. An oath is a form of excess.”

Imported from an open dataset — not yet checked against the printed edition.