We will now show of what numbers and of what sort of people a government ought to consist, that the state may be happy and well administered. As there are two particulars on which the excellence and perfection of everything depend, one of these is, that the object and end proposed should be proper; the other, that the means to accomplish it should be adapted to that purpose; for it may happen that these may either agree or disagree with each other; for the end we propose may be good, but in taking the means to obtain it we may err; at other times we may have the right and proper means in our power, but the end may be bad, and sometimes we may mistake in both; as in the art of medicine the physician does not sometimes know in what situation the body ought to be, to be healthy; nor what to do to procure the end he aims at. In every art and science, therefore, we should be master of this knowledge, namely, the proper end, and the means to obtain it. Now it is evident that all persons are desirous to live well and be happy; but that some have the means thereof in their own power, others not; and this either through nature [1332a] or fortune; for many ingredients are necessary to a happy life; but fewer to those who are of a good than to those who are of a bad disposition. There are others who continually have the means of happiness in their own power, but do not rightly apply them. Since we propose to inquire what government is best, namely, that by which a state may be best administered, and that state is best administered where the people are the happiest, it is evident that happiness is a thing we should not be unacquainted with. Now, I have already said in my treatise on Morals (if I may here make any use of what I have there shown), that happiness consists in the energy and perfect practice of virtue; and this not relatively, but simply; I mean by relatively, what is necessary in some certain circumstances; by simply, what is good and fair in itself: of the first sort are just punishments, and restraints in a just cause; for they arise from virtue and are necessary, and on that account are virtuous; though it is more desirable that neither any state nor any individual should stand in need of them; but those actions which are intended either to procure honour or wealth are simply good; the others eligible only to remove an evil; these, on the contrary, are the foundation and means of relative good. A worthy man indeed will bear poverty, disease, and other unfortunate accidents with a noble mind; but happiness consists in the contrary to these (now we have already determined in our treatise on Morals, that he is a man of worth who considers what is good because it is virtuous as what is simply good; it is evident, therefore, that all the actions of such a one must be worthy and simply good): this has led some persons to conclude, that the cause of happiness was external goods; which would be as if any one should suppose that the playing well upon the lyre was owing to the instrument, and not to the art. It necessarily follows from what has been said, that some things should be ready at hand and others procured by the legislator; for which reason in founding a city we earnestly wish that there may be plenty of those things which are supposed to be under the dominion of fortune (for some things we admit her to be mistress over); but for a state to be worthy and great is not only the work of fortune but of knowledge and judgment also. But for a state to be worthy it is necessary that those citizens which are in the administration should be worthy also; but as in our city every citizen is to be so, we must consider how this may be accomplished; for if this is what every one could be, and not some individuals only, it would be more desirable; for then it would follow, that what might be done by one might be done by all. Men are worthy and good three ways; by nature, by custom, by reason. In the first place, a man ought to be born a man, and not any other animal; that is to say, he ought to have both a body and soul; but it avails not to be only born [1332b] with some things, for custom makes great alterations; for there are some things in nature capable of alteration either way which are fixed by custom, either for the better or the worse. Now, other animals live chiefly a life of nature; and in very few things according to custom; but man lives according to reason also, which he alone is endowed with; wherefore he ought to make all these accord with each other; for if men followed reason, and were persuaded that it was best to obey her, they would act in many respects contrary to nature and custom. What men ought naturally to be, to make good members of a community, I have already determined; the rest of this discourse therefore shall be upon education; for some things are acquired by habit, others by hearing them.