_Direct._ VIII. Especially be very fearful of owning any public doctrine, or doing any public act, which tendeth to harden others in their perjury, or to encourage multitudes to commit the sin.[63] To be forsworn yourselves is a dreadful case; but to teach whole nations or churches to forswear themselves, or to plead for it, or justify it as a lawful thing, is much more dreadful. And though you teach not or own not perjury under the name of perjury, yet if first you will make plain perjury to seem no perjury, that so you may justify it, it is still a most inhuman, horrid act. God knoweth I insult not over the papists, with a delight to make any christians odious! but with grief I remember how lamentably they have abused our holy profession, while not only their great doctors, but their approved general council at the Lateran under Pope Innocent the Third, in the third canon hath decreed that the pope may depose temporal lords from their dominions, and give them unto others, and discharge their vassals from their allegiance and fidelity, if they be heretics, or will not exterminate heretics (even such as the holy men there condemned were, in the pope's account). To declare to many christian nations, that it is lawful to break their oaths and promises to their lawful lords and rulers, or their vows to God, and to undertake, by defending or owning this, to justify all those nations that shall be guilty of this perjury and perfidiousness, oh what a horrid crime is this! what a shame even unto human nature! and how great a wrong to the christian name!
_Direct._ IX. Understand and remember these following rules, to acquaint you how far a vow is obligatory: which I shall give you for the most part out of Dr. Sanderson, because his decisions of these cases are now of best esteem.
_Rule_ I. The general rule laid down Numb. xxx. 2, 3, doth make a vow, as such, to be obligatory, though the party should have a secret equivocation or intent, that though he speak the words to deceive another, yet he will not oblige himself. Such a reserve not to oblige himself hindereth not the obligation, but proveth him a perfidious hypocrite. Dr. Sanderson, p. 23, _Juramentum omne ex sua natura est obligatorium: ita ut si quis juret non intendens se obligare, nihilominus tamen suscipiendo juramentum ipso facto obligetur_: that is, If he so far understand what he doth, as that his words may bear the definition of an oath or vow; otherwise if he speak the words of an oath in a strange language, thinking they signify something else, or if he speak in his sleep, or deliration, or distraction, it is no oath, and so not obligatory.
_Rule_ II. Those conditions are to be taken as intended in all oaths, (whether expressed or no,) which the very nature of the thing doth necessarily imply[64] (unless any be so brutish as to express the contrary). And these are all reducible to two heads: 1. A natural, and, 2. A moral impossibility. 1. Whoever sweareth to do any thing, or give any thing, is supposed to mean, If I live; and if I be not disabled in my body, faculties, estate; if God make it not impossible to be, &c. For no man can be supposed to mean, I will do it whether God will or not, and whether I live or not, and whether I be able or not. 2. Whoever voweth or sweareth to do any thing, must be understood to mean it, If no change of providence make it a sin; or if I find not, contrary to my present supposition, that God forbiddeth it. For no man that is a christian is to be supposed to mean when he voweth, I will do this, though God forbid it, or though it prove to be a sin; especially when men therefore vow it, because they take it to be a duty. Now as that which is sinful is morally impossible, so there are divers ways by which a thing may appear or become sinful to us. (1.) When we find it forbidden directly in the word of God, which at first we understood not. (2.) When the change of things doth make that a sin, which before was a duty; of which may be given an hundred instances; as when the change of a man's estate, of his opportunities, of his liberty, of his parts and abilities, of objects, of customs, of the laws of civil governors, doth change the very matter of his duty.