We have thus shown that Happiness consists in exercise or actual living according to excellence; naturally, therefore, according to the highest excellence, or the excellence of the best part of man. This best part is the Intellect (_Nous_), our most divine and commanding element; in its exercise, which is theoretical or speculative, having respect to matters honourable, divine, and most worthy of study. Such philosophical exercise, besides being the highest function of our nature, is at the same time more susceptible than any mode of active effort, of being prosecuted for a long continuance. It affords the purest and most lasting pleasure; it approaches most nearly to being self-sufficing, since it postulates little more than the necessaries of life, and is even independent of society, though better _with_ society. Perfect happiness would thus be the exercise of the theorizing intellect, continued through a full period of life. But this is more than we can expect. Still, we ought to make every effort to live according to this best element of our nature; for, though small in bulk, it stands exalted above the rest in power and dignity, and, being the sovereign element in man, is really The Man himself (VII.).
Next, yet only second, come the other branches of excellence: the active social life of a good citizen. Exercises according to this branch of virtue are the natural business of man, for it is bound up with our whole nature, including body as well as mind, our appetites, and our passions, whereas the happiness of intellect is separate. Active social virtue postulates conditions of society and external aids in considerable measure; but the life of intellect requires only the minimum of these, and is even impeded by much of them.
That perfect happiness is to be found in the philosophical life only, will appear farther when we recollect that the gods are blest and happy in the highest degree, and that this is the only mode of life suitable to them. With the gods there can be no scope for active social virtues; for in what way can they be just, courageous, or temperate? Neither virtuous practice nor constructive art can be predicated of the gods; what then remains, since we all assume them to live, and therefore to be in act or exercise of some kind; for no one believes them to live in a state of sleep, like Endymion. There remains nothing except philosophical contemplation. This, then, must be the life of the gods, the most blest of all; and that mode of human life which approaches nearest to it will be the happiest. No other animal can take part in this, and therefore none can be happy. In so far as the gods pay attention to human affairs, they are likely to take pleasure in the philosopher, who is most allied to themselves. A moderate supply of good health, food, and social position, must undoubtedly be ensured to the philosopher; for, without these, human nature will not suffice for the business of contemplation. But he will demand nothing more than a moderate supply, and when thus equipped, he will approach nearer to happiness than any one else. Aristotle declares this confidently, citing Solon, Anaxagoras, and other sages, as having said much the same before him (VIII.).