Matthew 5:37

Otherwise; They who live in the simplicity of the faith have not need to swear, with them ever, what is is, what is not is not; by this their life and their conversation are ever preserved in truth.

Wherefore, with a loud and clear voice, I proclaim to all and testify, that those who are notorious for this transgression, who utter words which come "of the evil one," (for such is swearing,) shall not step over the threshold of the Church. Let this present month be the time allowed you for reforming in this matter. Talk not to me, "Necessity of business compels me to use oaths, else people do not believe me." To begin with this, retrench those oaths which come merely of habit.

"But what," it may be said, "if any one should require an oath, and apply constraint?" Let the fear of God be more powerful than the constraint: since, if thou art to bring forward such excuses, thou wilt keep none of the things which are enjoined. Yea, for first with respect to thy wife thou wilt say, "what if she be contentious and extravagant;" and then as to the right eye, "what if I love it, and am quite on fire?" and of the unchaste look, "what then, if I cannot help seeing?" and of our anger against a brother, "what if I be hasty, and not able to govern my tongue?" and in general, all His sayings thou mayest on this wise trample under foot. Yet surely with regard to human laws thou darest not in any case use this allegation, nor say, "what then if this or that be the case," but, willing or unwilling, thou receivest what is written. And besides, thou wilt never have compulsion to undergo at all. For he that hath hearkened unto those former blessings, and hath framed himself to be such as Christ enjoined, will have no such constraint to endure from any, being held in reverence and veneration by all. "But let your yea, be yea; and your nay, nay: for that which exceedeth these cometh of the evil one." What is it then that "exceeds yea" and "nay"? it is the oath, not the perjury. For this latter is quite acknowledged, and no man needs to learn that it is of the evil one; and it is not an excess, but an opposite: whereas an excess means something more, and added over and above: which kind of thing swearing is. "What then," saith one, "was it of the evil one? and if it was of the evil one, how was it a law?" Well, this same thing thou wilt say concerning the wife also; how is that now accounted adultery, which was before permitted? What now may one reply to this? That the precepts then uttered had reference to the weakness of them who were receiving the laws; since also to be worshipped with the vapor of sacrifice is very unworthy of God, just as to lisp is unworthy of a philosopher. That kind of thing accordingly was now laid down to be adultery, and swearing to be of the evil one, now that the principles of virtue have advanced. But if these things had been, from the first, laws of the devil, they would not have attained to so great goodness. Yea, for had those not been forerunners in the first place, these which we now have would not have been so easily received. Do not thou then require their excellency now, when their use is past: but then, when the time was calling for them. Or rather, if thou wilt, even now: yea, for now also is their virtue shown: and most of all for the very cause, by reason of which we find fault with them. For their appearing such now, is the greatest commendation of them. For had they not brought us up well, and made us meet for the reception of the greater precepts, they would not have appeared such. Therefore as the breast, when it hath fulfilled all its part, and is dismissing the child to the more manly diet, after that appears useless; and the parents who before thought it necessary for the babe, now abuse it with ten thousand mockeries (and many even not content with words of abuse, anoint it also with bitter drugs; that when their words have not power to remove the child's unseasonable propensity towards it, the real things may quench their longing): so also Christ saith, that they are of the evil one, not to indicate that the old law is of the devil, but in order that with most exceeding earnestness He might lead them away from their ancient poverty. But if the old law had belonged to the devil, it would not have led people away from idolatry, but rather would have drawn them on and cast them into it; for this did the devil desire. But now we see the opposite effect produced by the old law. And indeed this very thing, the oath, was ordained of old for this cause, that they might not swear by the idols. For "ye shall swear," saith He, "by the true God." They were then no small advantages whi

Therefore Evangelic verity does not admit an oath, since the whole discourse of the faithful is instead of an oath.

(ubi sup.) And he who has learned that an oath is to be reckoned not among things good, but among things necessary, will restrain himself as much as he may, not to use an oath without necessity, unless he sees men loth to believe what it is for their good they should believe, without the confirmation of an oath. This then is good and to be desired, that our conversation be only, yea, yea; nay, nay; for what is more than this cometh of evil. That is, if you are compelled to swear, you know that it is by the necessity of their weakness to whom you would persuade any thing; which weakness is surely an evil. What is more than this is thus evil; not that you do evil in this just use of an oath to persuade another to something beneficial for him; but it is an evil in him whose weakness thus obliges you to use an oath.