Nothing is more usual than to see parties, which have begun upon a real difference, continue even after that difference is lost. When men are once enlisted on opposite sides, they contract an affection to the persons with whom they are united, and an animosity against their antagonists; and these passions they often transmit to their posterity. The real difference between Guelf and Ghibelline was long lost in Italy, before these factions were extinguished. The Guelfs adhered to the pope, the Ghibellines to the emperor; yet the family of Sforza, who were in alliance with the emperor, though they were Guelfs, being expelled Milan by the king of France, assisted by Jacomo Trivulzio and the Ghibellines, the pope concurred with the latter, and they formed leagues with the pope against the emperor. The civil wars which arose some few years ago in Morocco between the _Blacks_ and _Whites_, merely on account of their complexion, are founded on a pleasant difference. We laugh at them; but, I believe, were things rightly examined, we afford much more occasion of ridicule to the Moors. For, what are all the wars of religion, which have prevailed in this polite and knowing part of the world? They are certainly more absurd than the Moorish civil wars. The difference of complexion is a sensible and a real difference; but the controversy about an article of faith, which is utterly absurd and unintelligible, is not a difference in sentiment, but in a few phrases and expressions, which one party accepts of without understanding them, and the other refuses in the same manner.[1] _Real_ factions may be divided into those from _interest_, from _principle_, and from _affection_. Of all factions, the first are the most reasonable, and the most excusable. Where two orders of men, such as the nobles and people, have a distinct authority in a government, not very accurately balanced and modelled, they naturally follow a distinct interest; nor can we reasonably expect a different conduct, considering that degree of selfishness implanted in human nature. It requires great skill in a legislator to prevent such parties; and many philosophers are of opinion, that this secret, like the _grand elixir_, or _perpetual motion_, may amuse men in theory, but can never possibly be reduced to practice. In despotic governments, indeed, factions often do not appear; but they are not the less real; or rather, they are more real and more pernicious upon that very account. The distinct orders of men, nobles and people, soldiers and merchants, have all a distinct interest; but the more powerful oppresses the weaker with impunity, and without resistance; which begets a seeming tranquillity in such governments.