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544 civil duties be the enforcing of our natural, yet the first motive of the invention, as well as performance of both, is nothing but self-interest: And since there is a separate interest in the obedience to government, from that in the performance of promises, we must also allow of a separate obligation. To obey the civil magistrate is requisite to preserve order and concord in society. To perform promises is requisite to beget mutual trust and confidence in the common offices of life. The ends, as well as the means, are perfectly distinct; nor is the one subordinate to the other.

To make this more evident, let us consider, that men will often bind themselves by promises to the performance of what it wou'd have been their interest to perform, independent of these promises; as when they wou'd give others a fuller security, by super-adding a new obligation of interest to that which they formerly lay under. The interest in the performance of promises, besides its moral obligation, is general, avow'd, and of the last consequence in life. Other interests may be more particular and doubtful; and we are apt to entertain a greater suspicion, that men may indulge their humour, or passion, in acting contrary to them. Here, therefore, promises come naturally in play, and are often requir'd for fuller satisfaction and security. But supposing those other interests to be as general and avow'd as the interest in the performance of a promise, they will be regarded as on the same footing, and men will begin to repose the same confidence in them. Now this is exactly the case with regard to our civil duties, or obedience to the magistrate; without which no government cou'd subsist, nor any peace or order be maintain'd in large societies, where there are so many possessions on the one hand, and so many wants, real or imaginary, on the other. Our civil duties, therefore, must soon detach themselves from our promises, and acquire a separate force and influence. The interest in both is of the very same kind: 'Tis general, avow'd, and prevails in all