_Direct._ VI. To make a vow lawful, besides the goodness of the thing which we vow, there must be a rational, discernible probability, that the act of vowing it will do more good than hurt; and this to a wise, foreseeing judgment. For this vowing is not an ordinary worship to be offered to God (except the baptismal vow, renewed in the Lord's supper and at other seasons); but it is left as an extraordinary means, for certain ends, which cannot by ordinary means be attained: and therefore we must discern the season, by discerning the necessity or usefulness of it. Swearing is a part of the service of God, but not of his daily worship, nor frequently and rashly to be used, by any that would not be held guilty of taking the name of God in vain: and so it is in the case of vowing. Therefore he that will make a lawful vow, must see beforehand, what is the probable benefit of it, and what is the probable hurt or danger: and without this foresight it must be rash, and cannot be lawful. And therefore no one can make a lawful vow, but wise, foreseeing persons, and those that advise with such, and are guided by them, if they be not such themselves; unless in a case where God hath prescribed by his own determining commands (as in the covenant of christianity). Therefore to one man the same vow may be a sin, that to another may be a duty; because one may have more reason for it, or necessity of it, and less danger by it, than another. One man may foresee that vowing (in case where there is no necessity) may insnare him either in perplexing doubts, or terrors, which will make all his life after more irregular or uncomfortable. Another man may discern that he is liable to no such danger.[51]
_Direct._ VII. No man should pretend danger or scruple against his renewing the vow of christianity, or any one essential part of it; viz. To take God the Father, Son, and Holy Ghost for my God, and Saviour, and Sanctifier, my Owner, Governor, and Father; renouncing the devil, the world, and the flesh. Because there is an absolute necessity, _præcepti et medii_, of performing this, and he that doth it not shall certainly be damned; and therefore no worse matter can stand up against it: he that denieth it, giveth up himself despairingly to damnation. Yet I have heard many say, I dare not promise to turn to God, and live a holy life, lest I break this promise, and be worse than before. But dost thou not know, that it must be both made and kept, if thou wilt be saved? Wilt thou choose to be damned, for fear of worse? There is but one remedy for thy soul, and all the hope of thy salvation lieth upon that alone. And wilt thou refuse that one, for fear lest thou cast it up and die? when thou shalt certainly die unless thou both take it, and keep it, and digest it.
_Direct._ VIII. About particular sins and duties, deliberate resolutions are the ordinary means of governing our lives; and vows must not be used where these will do the work without them. For extraordinary means must not be used, when ordinary will serve the turn. Nor must you needlessly draw a double guilt upon yourselves in case of sinning. And in mutable or doubtful cases, a resolution may be changed, when a vow cannot. Try therefore what deliberate resolutions will do, with the help of other ordinary means, before you go any further.
_Direct._ IX. When ordinary resolutions and other helps will not serve the turn, to engage the will to the forbearance of a known sin, or the performance of a known duty, but temptations are so strong as to bear down all, then it is seasonable to bind ourselves by a solemn vow, so it be cautelously and deliberately done, and no greater danger like to follow. In such a case of necessity, 1. You must deliberate on the benefits and need. 2. You must foresee all the assaults that you are like to have to tempt you to perjury, that they come not unexpected. 3. You must join the use of all other means for the keeping of your vows.
_Direct._ X. Make not a law and religion to yourselves by your voluntary vows, which God never made you by his authority; nor bind yourselves for futurity to all that is a duty at present, where it is possible that the change of things may change your duty. God is our King and Governor, and not we ourselves: it is not we, but he, that must give laws to us. We have work enough to do of his appointing; we need not make more to ourselves, as if he had not given us enough. Vows are not to make us new duties or religions, but to further us in the obedience of that which our Lord hath imposed on us. It is a self-condemning sin of foolish will-worshippers, to be busy in laying more burdens on themselves, when they know they cannot do so much as God requireth of them. Yea, some of them murmur at God's laws as too strict, and at the observers of them as too precise, (though they come far short of what is their duty,) and yet will be cutting out more work for themselves.