Individuals are physical beings, subject to laws universal and invariable. The immediate cause acting in these laws may be obscure: the general results are subject of certain calculation. But commonwealths are not physical, but moral essences. They are artificial combinations, and, in their proximate efficient cause, the arbitrary productions of the human mind. We are not yet acquainted with the laws which necessarily influence the stability of that kind of work made by that kind of agent. There is not in the physical order (with which they do not appear to hold any assignable connection) a distinct cause by which any of those fabrics must necessarily grow, flourish, or decay; nor, in my opinion, does the moral world produce anything more determinate on that subject than what may serve as an amusement (liberal, indeed, and ingenious, but still only an amusement) for speculative men. I doubt whether the history of mankind is yet complete enough, if ever it can be so, to furnish grounds for a sure theory on the internal causes which necessarily affect the fortune of a state. I am far from denying the operation of such causes; but they are infinitely uncertain and much more obscure, and much more difficult to trace, than the foreign causes that tend to raise, to depress, and sometimes to overwhelm a community.