Book I, Chapter XIII

Further, he who can be best fitted to rule can best fit others. For in every action the main end of the agent, whether acting by necessity of nature or voluntarily, is to unfold his own likeness; and therefore every agent, so far as he is of this sort, delights in action. For since all that is desires its own existence, and since the agent in acting enlarges his own existence in some way, delight follows action of necessity; for delight is inseparable from gaining what is desired. Nothing therefore acts unless it is of such sort as that which is acted on ought to be; therefore the Philosopher said in his Metaphysics,¹ "Everything which becomes actual from being potential, becomes so by means of something actual of the same kind," and were anything to try to act in any other way it would fail. Hence we may overthrow the error of those who think to form the moral character of others by speaking well and doing ill; forgetting that the hands of Jacob were more persuasive with his father than his words, though his hands deceived and his voice spake truth. Hence the Philosopher, to Nicomachus: "In matters of feeling and action, words are less to be trusted than deeds."² And therefore God said to David in his sin, "What hast thou to do to declare my statutes?" as though He would say, "Thou speakest in vain, for thou art different from what thou speakest." Hence it may be gathered that he needs to be fitted for his work in the best way who wishes to fit others.

But the Monarch is the only one who can be fitted in the best possible way to govern. Which is thus proved: Each thing is the more easily and perfectly qualified for any habit, or actual work, the less there is in it of what is contrary to such a disposition. Therefore, they who have never even heard of philosophy, arrive at a habit of truth in philosophy more easily and completely than those who have listened to it at odd times, and are filled with false opinions. For which reason Galen well says: "Such as these require double time to acquire knowledge."³ A Monarch then has nothing to tempt appetite, or, at least, less than any other man, as we have shown before; whereas other princes have much; and appetite is the only corrupter of righteousness, and the only impediment to justice. A Monarch therefore is wholly, or at least more than any other prince, disposed to govern well: for in him there may be judgment and justice more strongly than in any other. But these two things are the pre-eminent attributes of a maker of law, and of an executor of law, as that most holy king David testified when he asked of God the things which were befitting the king, and the king's son, saying: "Give the king thy judgment, O God, and thy righteousness unto the king's son."⁴

We were right then when we assumed that only the Monarch can be best fitted to rule. Therefore only the Monarch can in the best way fit other men. Therefore it follows that Monarchy is necessary for the best ordering of the world.