there be many things which prove materially unlawful, and one or more that are lawful, the conjunction of the things unlawful doth not disoblige me from the vow of doing the lawful part. Otherwise a man might make void all his vows to God, and oaths and covenants with men, by putting in something that is evil with the good; and so God, and the king, and our neighbours would have their debts paid by our sin and injury done them on the bye.
Rule XX. If some part of that which you vowed become impossible, that doth not disoblige you from so much as remaineth possible. As if you vow allegiance to the king, and tyrants or disability hinder you from serving him as subjects in some one particular way, you remain still obliged to serve him by those other ways in which you are yet capable to serve him. So if you had taken an oath against popery, to preach against it, and reject the practice of it, and for ever renounce it; this would not bind you from the common truths and duties of christianity, which papists hold in common with all other christians: nor could you preach against popery, if you were hindered by imprisonment, banishment, or restraint; but you have still power to forbear approving, consenting, subscribing, or practising their errors; and this you are still bound to do.
Rule XXI. Though you are not bound to do that of your vow which changes have made impossible or unlawful, yet if another change make them possible and lawful again, your obligation doth return afresh (unless you made it with such limitation). It is not a temporary cessation of the matter, or end, or correlate, that will perpetually discharge you from your vow. If your wife be taken captive many years, when she returneth, you are bound to the duties of a husband. If the king be expelled by usurpers, you are bound at present to so much duty as is possible, and to obey him as your actual governor when he returneth. But in the case of servants and soldiers, and other temporary relations, it is otherwise; for a removal may end the relation itself. If you promise to preach the gospel, to medicate the sick, to relieve the poor, to reform your families, &c. you are not hereby obliged to do it while any unresistible impediment maketh it impossible; but when the hinderance ceaseth, you are obliged to do it again; the matter and your capacity being restored.
Rule XXII. Therefore many a vow and promise may be lawfully unperformed, which may not be renounced or disclaimed. When you are taken captives you must forbear your duty to your king, your father, your husband or wife, but you may not therefore renounce them, and say, I have no obligation to them: no, not to the death; because they are relations for life; and how improbable soever it may seem that you should be returned to them, yet God can do it, and you must wait on him.
Rule XXIII. A former vow or promise is not nullified by a latter that contradicteth it.74 Otherwise a man might disoblige himself at his pleasure. Yet he that maketh contrary vows, obligeth himself to contraries and impossibles; and bringeth a necessity of perjury on himself, for not doing the things impossible which he vowed. And in some cases a later promise to men may null a former, when we made the former with the reserve of such a power or liberty, or are justly supposed to have power, to recall a former promise: or when it is the duty of a mutable relation which we vow, (as of a physician, a schoolmaster, &c.) and by a later vow we change the relation itself (which we may still lawfully change).
Rule XXIV. The actus jurandi must still be distinguished from the materia juramenti; and it very often cometh to pass that the act of swearing (or the oath as our act) is unlawfully done, and was a sin from the beginning, and yet it is nevertheless obligatory as long as the res jurata, the matter sworn, is lawful or necessary.75 Dr. Sanderson instanceth in Joshua's oath to the Gibeonites. The nature of the thing is proof enough; for many a thing is sinfully done, for want of a due call, or manner, or end, that yet is done, and is no nullity. A man may sinfully enter upon the ministry, that yet is bound to do the duty of a minister; and many marriages are sinful that are no nullities.
What is the nullity of an oath.
Rule XXV. The nullity of an oath ab initio, is quando realiter vel reputative non juravimus; when really or reputatively we did not swear. The sinfulness of an oath is when we did swear really but unlawfully as to the ground, or end, or matter, or manner, or circumstances. Really that man did not swear, 1. Who spake not (mentally nor orally) the words of an oath. 2. Who thought those words had signified no such thing, and so had no intent to swear either mentally or verbally. As if an Englishman be taught to use the words of an oath in French, and made believe that they have a contrary sense. 3. Who only narratively recited the words of an oath, as a reporter or historian, without a real or professed intent of swearing. Reputatively he did not swear, 1. Who spake the words of an oath in his sleep, or in a deliration, distraction, madness, or such prevalent melancholy as mastereth reason; when a man is not compos mentis, his act is not actus humanus. (2.) When a man's hand is forcibly moved by another against his will to subscribe the words of an oath or covenant; for if it be totally involuntary it is not a moral act. But words cannot be forced; for he that sweareth to save his life, doth do it voluntarily to save his life. The will may be moved by fear, but not forced. Yet the person that wrongfully frighteneth another into consent, or to swear, hath no right to any benefit which he thought to get by force or fraud; and so in foro civili such promises, or covenants, or oaths may quoad effectum be reputatively null; and he that by putting his sword to another man's breast doth compel him to swear or subscribe and seal a deed of gift, may be judged to have no right to it, but to be punishable for the force; but though this covenant or promise be null in foro humano, because the person cannot acquire a right by violence, yet the oath is not a nullity before God; for when God is made a party, he hath a right which is inviolable; and when he is appealed to or made a witness, his name must not be taken in vain. 3. It is a nullity reputatively when the person is naturally incapable of self-obligation, as in infancy, when reason is not come to so much maturity as to be naturally capable of such a work; I say naturally incapable, for the reasons following.
Rule XXVI. We must distinguish between a natural incapacity of vowing or swearing at all, and an incapacity of doing it lawfully; and between a true nullity, and when the oath is only quasi nullum, or as null quoad effectum, or such as I must not keep. There are many real oaths and vows which must not be kept, and so far are quasi nulla as to the effecting of the thing vowed; but they are not simply null; for they have the effect of making the man a sinner and perjured. They are sinful vows, and therefore vows. A natural incapacity proveth it no vow at all; but if I am naturally capable, and only forbidden, (by God or man,) this maketh it not no vow, but a sinful vow, of which some must be kept and some must not.
Cases in which a vow must not be kept.
In these following cases a real vow is quasi nullum, or must not be kept.
1. In case the thing vowed (all things considered) be a thing which God hath forbidden to be done; that is, in case it be a thing in itself evil; but if the thing in itself be a duty, though there be some inseparable sins which we shall be guilty of in the performance, we must not therefore leave the duty itself undone which we have vowed: as if I vow to praise God, and yet am sure that I cannot praise him without a sinful defect of that love and delight in him which is due, I must not therefore forbear to praise him; else we must cast off all other duty, because we cannot do it without some sin. But yet, though in case of unwilling infirmity, we must thus do the duty though we are sure to sin in it, yet in case of any chosen, voluntary sin, which we have an immediate power to avoid, we must rather forbear the duty itself (vowed or not vowed) than commit such a sin; as if I vow to preach the gospel, and am forcibly hindered unless I would voluntarily tell one lie, or commit one sin wilfully for this liberty; I ought rather never to preach the gospel; nor is it then a duty, but become morally impossible to me; as if in France or Spain I may not preach unless I would take Pope Pius's Trent confession or oath. Nay, if those very defects of love, and wandering thoughts, which now inseparably cleave to my best performances, were morally and immediately in my power, and I could avoid them, I ought not electively and by consent to commit them, for any liberty of duty, but rather to forbear the duty itself as no duty to me when it cometh
Sanders. p. 50.
Sanders. p. 55, 56. In quo casu locum habet quod vulgo dicitur, Fieri non debet, factum valet: possumus ergo distinguere, juramentum dici illicitum duobus modis. Vel respectu rei juratæ, vel respectu actus jurandi: Juramentum illicitum respectu rei juratæ nullatenus obligat: Juramentum illicitum respectu actus jurandi obligat, nisi aliunde impediatur.
