Aristotle's solution of this problem follows from the general principles of his philosophy. We have seen that, throughout nature, every being has its proper end, and the attainment of this end is its special function. Hence the good for each being must be the adequate performance of its special function. The good for man will not consist in the pleasure of the senses. Sensation is the special function of animals, but not of man. Man's special function is reason. Hence the proper {316} activity of reason is the _summum bonum_, the good for man. Morality consists in the life of reason. But what precisely that means we have still to see. Man is not only a reasoning animal. As the higher being, he contains within himself the faculties of the lower beings also. Like plants he is appetitive, like animals, sensitive. The passions and appetites are an organic part of his nature. Hence virtue will be of two kinds. The highest virtues will be found in the life of reason, and the life of thought, philosophy. These intellectual virtues are called by Aristotle dianoetic. Secondly, the ethical virtues proper will consist in the submission of the passions and appetites to the control of reason. The dianoetic virtues are the higher, because in them man's special function alone is in operation, and also because the thinking man most resembles God, whose life is a life of pure thought. Happiness, therefore, consists in the combination of dianoetic and ethical virtues. They alone are of absolute value to man. Yet, though he places happiness in virtue, Aristotle, in his broad and practical way, does not overlook the fact that external goods and circumstances have a profound influence upon happiness, and cannot be ignored, as the Cynics attempted to ignore them. Not that Aristotle regards externals as having any value in themselves. What alone is good in itself, is an end in itself, is virtue. But external goods help a man in his quest of virtue. Poverty, sickness, and misfortune, on the other hand, hinder his efforts. Therefore, though externals are not goods in themselves, they may be a means towards the good. Hence they are not to be despised and rejected. Riches, friends, health, {317} good fortune, are not happiness. But they are negative conditions of it. With them happiness is within our grasp. Without them its attainment is difficult. They will be valued accordingly.