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519 has also a natural inclination to it. And if no human creature had that inclination, no one cou'd lie under any such obligation. But as there is naturally no inclination to observe promises, distinct from a sense of their obligation; it follows, that fidelity is no natural virtue, and that promises have no force, antecedent to human conventions.

If any one dissent from this, he must give a regular proof of these two propositions, viz. that there is a peculiar act of the mind, annext to promises; and that consequent to this act of the mind, there arrises an inclination to perform, distinct from a sense of duty. I presume, that it is impossible to prove either of these two points; and therefore I venture to conclude, that promises are human inventions, founded on the necessities and interests of society.

In order to discover these necessities and interests, we must consider the same qualities of human nature, which we have already found to give rise to the preceding laws of society. Men being naturally selfish, or endow'd only with a confin'd generosity, they are not easily induc'd to perform any action for the interest of strangers, except with a view to some reciprocal advantage, which they had no hope of obtaining but by such a performance. Now as it frequently happens, that these mutual performances cannot be finish'd at the same instant, 'tis necessary, that one party be contented to remain in uncertainty, and depend upon the gratitude of the other for a return of kindness. But so much corruption is there among men, that, generally speaking, this becomes but a slender security; and as the benefactor is here suppos'd to bestow his favours with a view to self interest, this both takes off from the obligation, and sets an example of selfishness, which is the true mother of ingratitude. Were we, therefore, to follow the natural course of our passions and inclinations, we shou'd perform but few actions for the advantage of others, from disinterested views; because we are naturally very limited in our kindness and affection: And we shou'd perform as few of that kind, out of