Of the passions that stir the heart of man, there is one which makes the sexes necessary to each other, and is extremely ardent and impetuous; a terrible passion that braves danger, surmounts all obstacles, and in its transports seems calculated to bring destruction on the human race which it is really destined to preserve. What must become of men who are left to this brutal and boundless rage, without modesty, without shame, and daily upholding their amours at the price of their blood? It must, in the first place, be allowed that, the more violent the passions are, the more are laws necessary to keep them under restraint. But, setting aside the inadequacy of laws to effect this purpose, which is evident from the crimes and disorders to which these passions daily give rise among us, we should do well to inquire if these evils did not spring up with the laws themselves; for in this case, even if the laws were capable of repressing such evils, it is the least that could be expected from them, that they should check a mischief which would not have arisen without them. Let us begin by distinguishing between the physical and moral ingredients in the feeling of love. The physical part of love is that general desire which urges the sexes to union with each other. The moral part is that which determines and fixes this desire exclusively upon one particular object; or at least gives it a greater degree of energy toward the object thus preferred. It is easy to see that the moral part of love is a factitious feeling, born of social usage, and enhanced by the women with much care and cleverness, to establish their empire, and put in power the sex which ought to obey. This feeling, being founded on certain ideas of beauty and merit which a savage is not in a position to acquire, and on comparisons which he is incapable of making, must be for him almost non-existent; for, as his mind cannot form abstract ideas of proportion and regularity, so his heart is not susceptible of the feelings of love and admiration, which are even insensibly produced by the application of these ideas. He follows solely the character nature has implanted in him, and not tastes which he could never have acquired; so that every woman equally answers his purpose.