This also is evident, that [human] life becomes different from disposition and action. But it is necessary that the disposition should be either worthy or depraved; and that action should be attended either with felicity or misery. And a worthy disposition, indeed, participates of virtue; but a bad one of vice. With respect to actions, also, those that are prosperous are attended with felicity; (for they derive their completion through looking to reason) but those that are unfortunate, are attended with misery; for they are frustrated of the end. Hence, it is not only necessary to learn virtue, but also to possess and use it, either for security, or increase, [of property when it is too little] or, which is the greatest thing of all, for the emendation of families and cities. For it is not only necessary to have the possession of things beautiful, but also the use of them. All these things, however, will take place, when a man lives in a city that uses equitable laws. And these, indeed, I say, are what is called the horn of Amalthea. For all things are contained in equitable legislation. And without this, the greatest good of human nature can neither be effected, nor, when effected, be increased and become permanent. For this comprehends in itself virtue, and the tendency to virtue; because excellent natures are generated according to it. Manners, likewise, studies, and laws, subsist through this in the most excellent condition; and besides these, rightly-deciding reason, and piety and sanctity towards the most honorable natures. So that it is necessary that he who is to be happy, and whose life is to be prosperous, should live and die in a country governed by equitable laws, relinquishing all illegality. At the same time what has been said is attended with necessity. For man is a part of society, and hence from the same reasoning, will become entire and perfect, if he not only associates with others, but associates in a becoming manner. For some things are naturally adapted to subsist in many things, and not in one thing; others in one thing, and not in many; but others both in many, and in one thing, and on this account in one thing, because in many. For harmony, indeed, and symphony and number, are naturally adapted to be ingenerated in many things. For nothing which makes a whole from these parts, is sufficient to itself.[57] But acuteness of seeing and hearing, and swiftness of feet, subsist in one thing alone. Felicity, however, and the virtue of soul, subsist both in one thing and in many, in a whole, and in the universe. And on this account they subsist in one thing, because they also subsist in many: and they subsist in many, because they are inherent in a whole and in the universe. For the orderly distribution of the whole nature of things methodically arranges each particular. And the orderly distribution of particulars gives completion to the whole of things and to the universe.