11. Hence they endeavoured still more firmly to restrain those who readily destroyed each other, and who, through an oblivion of past transactions, prepared a more imbecile defence. But in attempting to effect this, they introduced those legal institutes which still remain in cities and nations; the multitude spontaneously assenting to them, in consequence of now perceiving, in a greater degree, the advantage arising from an association with each other. For the destruction of every thing noxious, and the preservation of that which is subservient to its extermination, similarly contribute to a fearless life. And hence it is reasonable to suppose, that one of the above-mentioned particulars was forbidden, but that the other was not prohibited. Nor must it be said, that the law allows us to destroy some animals which are not corruptive of human nature, and which are not in any other way injurious to our life. For, as I may say, no animal among those which the law permits us to kill is of this kind; since, if we suffered them to increase excessively, they would become injurious to us. But through the number of them which is now preserved, certain advantages are imparted to human life. For sheep and oxen, and every such like animal, when the number of them is moderate, are beneficial to our necessary wants; but if they become redundant in the extreme, and far exceed the number which is sufficient, they then become detrimental to our life; the latter by employing their strength, in consequence of participating of this through an innate power of nature, and the former, by consuming the nutriment which springs up from the earth for our benefit alone. Hence, through this cause, the slaughter of animals of this kind is not prohibited, in order that as many of them as are sufficient for our use, and which we may be able easily to subdue, may be left. For it is not with horses, oxen, and sheep, and with all tame animals, as it is with lions and wolves, and, in short, with all such as are called savage animals, that, whether the number of them is small or great, no multitude of them can be assumed, which, if left, would alleviate the necessity of our life. And on this account, indeed, we utterly destroy some of them; but of others, we take away as many as are found to be more than commensurate to our use.