rendered men tolerable to each other; that of the transference of property and possession by consent has begun to render them mutually advantageous:  But still these laws of nature, however strictly observed, are not sufficient to render them so serviceable to each other, as by nature they are fitted to become.  Though possession be stable, men may often reap but small advantage from it, while they are possessed of a greater quantity of any species of goods than they have occasion for, and at the same time suffer by the want of others.  The transference of property, which is the proper remedy for this inconvenience, cannot remedy it entirely; because it can only take place with regard to such objects as are present and individual, but not to such as are absent or general.  One cannot transfer the property of a particular house, twenty leagues distant; because the consent cannot be attended with delivery, which is a requisite circumstance.  Neither can one transfer the property of ten bushels of corn, or five hogsheads of wine, by the mere expression and consent; because these are only general terms, and have no direct relation to any particular heap of corn, or barrels of wine.  Besides, the commerce of mankind is not confined to the barter of commodities, but may extend to services and actions, which we may exchange to our mutual interest and advantage.  Your corn is ripe to-day; mine will be so tomorrow.  It is profitable for us both, that I should labour with you to-day, and that you should aid me to-morrow.  I have no kindness for you, and know you have as little for me.  I will not, therefore, take any pains upon your account; and should I labour with you upon my own account, in expectation of a return, I know I should be disappointed, and that I should in vain depend upon your gratitude.  Here then I leave you to labour alone:  You treat me in the same manner.  The seasons change; and both of us lose our harvests for want of mutual confidence and security.

All this is the effect of the natural and inherent principles and passions of human nature; and as these passions and principles are inalterable, it may be thought, that our conduct, which depends on them, must be so too, and that it would be in vain, either for moralists or politicians, to tamper with us, or attempt to change the usual course of our actions, with a view to public interest.  And indeed, did the success of their designs depend upon their success in correcting the selfishness and ingratitude of men, they would never make any progress, unless aided by omnipotence, which is alone able to new-mould the human mind, and change its character in such fundamental articles.  All they can pretend to, is, to give a new direction to those natural passions, and teach us that we can better satisfy our appetites in an oblique and artificial manner, than by their headlong and impetuous motion.  Hence I learn to do a service to another, without bearing him any real kindness; because I forsee, that he will return my service, in expectation of another of the same kind, and in order to maintain the same correspondence of good offices with me or with others.  And accordingly, after I have served him, and he is in possession of the advantage arising from my action, he is induced to perform his part, as foreseeing the consequences of his refusal.