Matthew 5:36

non occ.: The Lord has hitherto taught to abstain from injuring our neighbour, forbidding anger with murder, lust with adultery, and the putting away a wife with a bill of divorce. He now proceeds to teach to abstain from injury to God, forbidding not only perjury as an evil in itself, but even all oaths as the cause of evil, saying, "Ye have heard it said by them of old, Thou shalt not forswear thyself." It is written in Leviticus, "Thou shalt not forswear thyself in my name;" [Lev 19:12] and that they should not make gods of the creature, they are commanded to render to God their oaths, and not to swear by any creature, "Render to the Lord thy oaths;" that is, if you shall have occasion to swear, you shall swear by the Creator and not by the creature. As it is written in Deuteronomy, "Thou shalt fear the Lord thy God, and shalt swear by his name." [Deut 6:13]

This was allowed under the Law, as to children; as they offered sacrifice to God, that they might not do it to idols, so they were permitted to swear by God; not that the thing was right, but that it were better done to God than to daemons.

For no man can swear often, but he must sometimes forswear himself; as he who has a custom of much speaking will sometimes speak foolishly.

Inasmuch as the sin of perjury is a grievous sin, he must be further removed from it who uses no oath, than he who is ready to swear on every occasion, and the Lord would rather that we should not swear and keep close to the truth, than that swearing we should come near to perjury.

This precept also confirms the righteousness of the Pharisees, not to forswear; inasmuch as he who swears not at all cannot forswear himself. But as to call God to witness is to swear, does not the Apostle break this commandment when he says several times to the Galatians, "The things which I write unto you, behold, before God, I lie not." [Gal 1:20] So the Romans, "God is my witness, whom I serve in my spirit." [Rom 1:9] Unless perhaps some one may say, it is no oath unless I use the form of swearing by some object; and that the Apostle did not swear in saying, "God is my witness." It is ridiculous to make such a distinction; yet the Apostle has used even this form, "I die daily, by your boasting." [1 Cor 15:31] That this does not mean, your boasting has caused my dying daily, but is an oath, is clear from the Greek, which is.

But what we could not understand by mere words, from the conduct of the saints we may gather in what sense should be understood what might easily be drawn the contrary way, unless explained by example. The Apostle has used oaths in his Epistles, and by this shews us how that ought to be taken, "I say unto you, Swear not at all," namely, lest by allowing ourselves to swear at all we come to readiness in swearing, from readiness we come to a habit of swearing, and from a habit of swearing we fall into perjury. And so the Apostle is not found to have used an oath but only in writing, the greater thought and caution which that requires not allowing of slip of the tongue. Yet is the Lord's command so universal, "Swear not at all," that He would seem to have forbidden it even in writing. But since it would be an impiety to accuse Paul of having violated this precept, especially in his Epistles, we must understand the word "at all" as implying that, as far as lays in your power, you should not make a practice of swearing, not aim at it as a good thing in which you should take delight.

Therefore in his writings, as writing allows of greater circumspection, the Apostle is found to have used an oath in several places, that none might suppose that there is any direct sin in swearing what is true; but only that our weak hearts are better preserved from perjury by abstaining from all swearing whatever.

Lastly, consider that the Saviour does not here forbid to swear by God, but by the Heaven, the Earth, by Jerusalem, by a man's head. For this evil practice of swearing by the elements the Jews had always, and are thereof often accused in the prophetic writings. For he who swears, shew either reverence or love for that by which he swears. Thus when the Jews swore by the Angels, by the city of Jerusalem, by the temple and the elements, they paid to the creature the honour and worship belonging to God; for it is commanded in the Law that we should not swear but by the Lord our God.

Or; It is added, "By the Heaven, &c." because the Jews did not consider themselves bound when they swore by such things. As if He had said, When you swear by the Heaven and the Earth, think not that you do not owe your oath to the Lord your God, for you are proved to have sworn by Him whose throne the heaven is, and the earth His footstool; which is not meant as though God had such limbs set upon the heaven and the earth, after the manner of a man who is sitting; but that seat signifies God's judgment of us. And since in the whole extent of this universe it is the heaven that has the highest beauty, God is said to sit upon the heavens as shewing divine power to be more excellent than the most surpassing show of beauty; and He is said to stand upon the earth, as putting to lowest use a lesser beauty. Spiritually by the heavens are denoted holy souls, by the earth the sinful, seeing "He that is spiritual judgeth all things." [1 Cor 2:15] But to the sinner it is said, "Earth thou art, and unto earth thou shalt return." [Gen 3:19] And he who would abide under a law, is put under a law, and therefore He adds, "it is the footstool of His feet. Neither by Jerusalem, for it is the city of the Great King;" this is better said than "it is mine;" though it is understood to mean the same. And because He is also truly Lord, whoso swears by Jerusalem, owes his oath to the Lord. "Neither by thy head." What could any think more entirely his own property than his own head? But how is it ours when we have not power to make one hair black or white? Whoso then swears by his own head also owes his vows to the Lord; and by this the rest may be understood.

Note how He exalts the elements of the world, not from their own nature, but from the respect which they have to God, so that there is opened no occasion of idolatry.

Having forbidden swearing, He instructs us how we ought to speak, "Let your speech be yea, yea; nay, nay." That is, to affirm any thing it is sufficient to say, "It is so;" to deny, to say, "It is not so." Or, "yea, yea; nay, nay," are therefore twice repeated, that what you affirm with the mouth you should prove in deed, and what you deny in word, you should not establish by your conduct.

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.

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

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.

Or; "of evil," that is, from their weakness to whom the Law permitted the use of an oath. Not that by this the old Law is signified to be from the Devil, but He leads us from the old imperfection to the new abundance.

The more, then, a man hastes to the end, the more truly venerable is he, having God alone as his senior, since He is the eternal aged One, He who is older than all things. Prophecy has called him the “Ancient of days; and the hair of His head was as pure wool,” says the prophet. “And none other,” says the Lord, “can make the hair white or black.” How, then, do these godless ones work in rivalry with God, or rather violently oppose Him, when they transmute the hair made white by Him? “The crown of old men is great experience,” says Scripture; and the hoary hair of their countenance is the blossom of large experience. But these dishonour the reverence of age, the head covered with grey hairs. It is not, it is not possible for him to show the head true who has a fraudulent head. …

If we think over the rest of faults, tracing them from their generations, let us begin with covetousness, “a root of all evils,” wherewith, indeed, some having been ensnared, “have suffered shipwreck about faith.” Albeit covetousness is by the same apostle called idolatry . In the next place proceeding to mendacity, the minister of covetousness (of false swearing I am silent, since even swearing is not lawful), is trade adapted for a servant of God? But, covetousness apart, what is the motive for acquiring? When the motive for acquiring ceases, there will be no necessity for trading. Grant now that there be some righteousness in business, secure from the duty of watchfulness against covetousness and mendacity; I take it that that trade which pertains to the very soul and spirit of idols, which pampers every demon, falls under the charge of idolatry. …

I see some (women) turn (the colour of) their hair with saffron. They are ashamed even of their own nation, (ashamed) that their procreation did not assign them to Germany and to Gaul: thus, as it is, they transfer their hair (thither)! Ill, ay, most ill, do they augur for themselves with their flame-coloured head, and think that graceful which (in fact) they are polluting! Nay, moreover, the force of the cosmetics burns ruin into the hair; and the constant application of even any un drugged moisture, lays up a store of harm for the head; while the sun’s warmth, too, so desirable for imparting to the hair at once growth and dryness, is hurtful. …

16. The voice of the warning apostle is, “Purge out the old leaven, that ye may be a new lump, as ye are unleavened; for even Christ our passover is sacrificed. Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth.” But are sincerity and truth preserved, when what is sincere is polluted by adulterous colours, and what is true is changed into a lie by the deceitful dyes of medicaments? Your Lord says, “Thou canst not make one hair white or black;” and you, in order to overcome the word of your Lord, will be more mighty than He, and stain your hair with a daring endeavour and with profane contempt. …

2. One of your doubts is as to using the services of a man who has guaranteed his fidelity by swearing by his false gods. In this matter I beg you to consider whether, in the event of a man failing to keep his word after having pledged himself by such an oath, you would not regard him as guilty of a twofold sin. For if he kept the engagement which he had confirmed by this oath, he would be pronounced guilty in this only, that he swore by such deities; but no one would justly blame him for keeping his engagement. …

49. But I shall select examples of the majestic style from their treatment of a subject which both of them have touched. Both have denounced the women who color, or rather discolor, their faces with paint. And the first, in dealing with this topic, says: “Suppose a painter should depict in colors that rival nature’s the features and form and complexion of some man, and that, when the portrait had been finished with consummate art, another painter should put his hand over it, as if to improve by his superior skill the painting already completed; surely the first artist would feel deeply insulted, and his indignation would be justly roused. …

3. As "the law and the prophets" may have three different meanings, it is uncertain in what sense the words are used by Jesus, though we may form a conjecture from what follows. For if Jesus had gone on to speak of circumcision, and Sabbaths, and sacrifices, and the observances of the Hebrews, and had added something as a fulfillment, there could have been no doubt that it was the law and the prophets of the Jews of which He said that He came not to destroy, but to fulfill them. But Christ, without any allusion to these, speaks only of commandments which date from the earliest times: "Thou shall not kill; Thou shalt not commit adultery; Thou shalt not bear false witness." These, it can be proved, were of old promulgated in the world by Enoch and Seth, and the other righteous men, to whom the precepts were delivered by angels of lofty rank, in order to tame the savage nature of men. …

10. Ye applaud what is now said, but when ye have amended, ye will applaud in a greater degree not only us, but also yourselves; and ye will hear with more pleasure what is spoken; and ye will call upon God with a pure conscience, who is so sparing of thee, O man! that He saith, “Neither shalt thou swear by thy head.” But thou so despisest Him as to swear even by His glory. “But what shall I do,” saith one, “with those who impose necessity on me?” What kind of necessity can there be, O man? Let all men understand that thou wilt choose to suffer anything rather than transgress the law of God; and they will abstain from compelling thee. …

“Neither by thy head,” saith He, “because thou canst not make one hair white or black.”

Such then are those, who pride themselves upon their wisdom, and fall into the excess of recklessness. For recklessness of all things makes a person a fool. Wherefore the Prophet calls the barbarian by this name. But “the fool,” he says, “shall speak folly.” ( Is. xxxii. 6 .) But that you may see the folly of him from his own words, hear what he says. “Above the stars of heaven will I place my throne, and I will be like the Most High.” ( ib. xiv. 14 .) “I will take hold of the world as a nest, and as eggs that are left will I take them away.” ( ib. x. 14 .) Now what can be more foolish than these words? And every instance of haughty language immediately draws on itself this reproach. And if I were to set before you every expression of them that are reckless, you would not be able to distinguish whether the words are those of a reckless man or a fool. …