of His Son, that without ceasing I make mention of you always in my prayers.”159 Unless, perchance, one were to say that it is to be reckoned swearing only when something is spoken of by which one swears; so that he has not used an oath, because he has not said, by God; but has said, “God is witness.” It is ridiculous to think so; yet because of the contentious, or those very slow of apprehension, lest any one should think there is a difference, let him know that the apostle has used an oath in this way also, saying, “By your rejoicing, I die daily.” 160 And let no one think that this is so expressed as if it were said, Your rejoicing makes me die daily; just as it is said, By his teaching he became learned, i.e. by his teaching it came about that he was perfectly instructed: the Greek copies decide the matter, where we find it written, Νὴ τὴν καύχησιν ὑμετέραν, an expression which is used only by one taking an oath. Thus, then, it is understood that the Lord gave the command not to swear in this sense, lest any one should eagerly seek after an oath as a good thing, and by the con- stant use of oaths sink down through force of habit into perjury. And therefore let him who understands that swearing is to be reckoned not among things that are good, but among things that are necessary, refrain as far as he can from indulging in it, unless by necessity, when he sees men slow to believe what it is useful for them to believe, except they be assured by an oath. To this, accordingly, reference is made when it is said, “Let your speech be, Yea, yea; Nay, nay;” this is good, and what is to be desired. “For whatsoever is more than these cometh of evil;” i.e., if you are compelled to swear, know that it comes of a necessity arising from the infirmity of those whom you are trying to persuade of something; which infirmity is certainly an evil, from which we daily pray to be delivered, when we say, “Deliver us from evil.” 161 Hence He has not said, Whatsoever is more than these is evil; for you are not doing what is evil when you make a good use of an oath, which, although not in itself good, is yet necessary in order to persuade another that you are trying to move him for some useful end; but it “cometh of evil” on his part by whose infirmity you are compelled to swear.162 But 23 no one learns, unless he has had experience, how difficult it is both to get rid of a habit of swearing, and never to do rashly what necessity sometimes compels him to do.163 159 Rom. i. 9. 160 1 Cor. xv. 31. 161 Matt. vi. 13. 162 Revised Version, Evil One. So Euthymius, Zig. (auctorem habet diabolum), Chrysostom, Theophylact, Fritzsche, Keim, Meyer, Plumptre, etc. The interpretation of Augustin is shared by Luther, Bengel, De Wette, Tholuck, Ewald, etc. 163 Augustin is somewhat perplexed about the meaning, but decides the injunction to be directed against the abuse of the oath, not to forbid it wholly. The oath was permitted by the law (Lev. xxii. 11), was to be held sacred (Num. xxx. 2), and to be made in God’s name (Deut. vi. 13). It was customary under the Old Testament 60 Chapter XVII