T 3.2.6.6

Secondly, Those rules, by which properties, rights, and obligationsproperty, right, and obligation are determin'd, have in them no marks of a natural origin, but many of artifice and contrivance. They are too numerous to have proceeded from nature: They are changeable by human laws: And have all of them a direct and evident tendency to public good, and the support of civil societysociety. This last circumstance is remarkable upon two |accounts. First, because, tho' the cause of the establishment of these laws had been a regard for the public good, as much as the public good is their natural tendency, they wou'd still have been artificial, as being purposely contriv'd and directed to a certain end. Secondly, because, if men had been endow'd with such a strong regard for public good, they wou'd never have restrain'd themselves by these rules; so that the laws of justice arise from natural principles in a manner still more oblique and artificial. 'Tis self-love which is their real origin; and as the self-love of one person is naturally contrary to that of another, these several interested passions are oblig'd to adjust themselves after such a manner as to concur in some system of conduct and behaviour. This system, therefore, comprehending the interest of each individual, is of course advantageous to the public; tho' it be not intended for that purpose by the inventors.