Pope Joan wrote:...I also believe in taking the Sermon on the Mount literally, so I will not swear an oath in court
Sorry, could you explain me this one?
Matthew wrote:“And again, you’ve heard what was said to the people of long ago, “You shall not perjure yourself, instead keep the oaths you make to the Lord.” But I tell you, don’t swear at all, not by heaven, because it’s the throne of God, not by the earth, because it’s God’s footstool, not by Jerusalem, because it’s the city of the great King. Don’t even swear by your head, because you’re not able to make one hair white or black. Simply say yes, or no—more than this comes from the evil one.
I think it's quite evident that Jesus here is talking about "taking an oath" as a method used to increase the importance of one's own words - to certify the listeners that the speech is truthful - by invoking divine/otherwordly punishment on himself in the case he speaks a lie.
Taking an oath in a court has a different meaning: the witness states that he knows that speaking a lie in a court as a witness is a crime, and is fully aware of the mundane consequences of such an act.





