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THe title of this §. implies a distinction of reasons considerable in this* 1.1 particular. For sometimes it happens that onely one reason dies, and there is no other change, but that the efficient cause of the law, from whence it had it's being, is dead. But sometimes it is more then so; for not onely the reason of the law is gone, but a nettle is risen up in the place of it, and that which was once profitable is become intolerable, and that which was just is now dishonest, and that which was righteous will not be righte∣ous still, but against the public interest. * Now when a contrary reason does arise there is no peradventure but the law ceases: and this is to be extended not onely to the case of injustice or impossiblity, but of trouble or of use∣lesnesse; that is, if the contrary reason makes things so that the law could not justly have been impos'd, or if it had been de facto impos'd, it could not oblige the conscience, then the conscience is restor'd to liberty and dis∣obligation. * But then this case must be manifest: for if it be doubtfull, the law retains her power; for it is in possession, and the justice of it is pre∣sum'd.
But if the reason of the law ceases onely,* 1.2 and no more, there is some more difficulty, for it may be the will of the Prince does not cease, and he intends the law should last for the support of his authority; and that will be reason enough to keep up a law that once was good and now hath no harm in it: and there ought to be a great reason that shall change a custome, though it be good for nothing; and where there was a law, a custome will easily be suppos'd, especially if the law was usefull and reasonable, as we suppose in the present case. And if the law did prevail unto a custome, and that it be not safe to change a custome, then though the proper reason of the law be ceas'd, there is another reason arisen in the place of it that will be enough to bind the conscience to obedience. For the stating of this question, it is still necessary that we yet first distinguish, and then define.
1. Some laws have in them a natural rectitude or usefulnesse in order to moral ends,* 1.3 by reason of the subject matter of the law, or by reason that the instance of the law is made an instrument of vertue by the appoint∣ment of law. 2. Others have onely an acquir'd rectitude, and an extrinsic end; that is, it was by the law-giver commanded in order to a certain pur∣pose, and beyond that purpose it serves for nothing. Thus when a Prince imposes a tribute upon a Country for the building of certain bridges, when the work is done, the tribute is of no public emolument. But if he imposes