They Said “Happiness depends on ourselves.” More than anybody else, Aristotle enshrines happiness as a central purpose of human life and a goal in itself. As a result he devotes more space to the topic of happiness than any thinker prior to the modern era. Living during the same period as Mencius, but on the other side of the world, he draws some similar conclusions. That is, happiness depends on the cultivation of virtue, though his virtues are somewhat more individualistic than the essentially social virtues of the Confucians. Yet as we shall see, Aristotle was convinced that a genuinely happy life required the fulfillment of a broad range of conditions, including physical as well as mental well-being. In this way he introduced the idea of a science of happiness in the classical sense, in terms of a new field of knowledge.
I Said
Happiness is not depend on other than yourself, whenever think about the matter effective to all concerned to your self, I also believe the conditions and situations are affect you happiness are completely surrounding you. Sometime its time being conditions and sometime its comparatively valued. Not a permanent and fixed value for all. As Buddha the Middle Path referred to a peaceful way of life which negotiated the extremes of harsh asceticism and sensual pleasure seeking. so finally life is with limitation of thinking hence it true if we can say “function of man is to live a certain kind of life”