The Human Good and the Function Argument
The principal idea with which Aristotle begins is that there are differences of opinion about what is best for human beings, and that to profit from ethical inquiry we must resolve this disagreement. He insists that ethics is not a theoretical discipline: we are asking what the good for human beings is not simply because we want to have knowledge, but because we will be better able to achieve our good if we develop a fuller understanding of what it is to flourish. In raising this question—what is the good?—Aristotle is not looking for a list of items that are good. He assumes that such a list can be compiled rather easily; most would agree, for example, that it is good to have friends, to experience pleasure, to be healthy, to be honored, and to have such virtues as courage at least to some degree. The difficult and controversial question arises when we ask whether certain of these goods are more desirable than others. Aristotle's search for the good is a search for the highest good, and he assumes that the highest good, whatever it turns out to be, has three characteristics: it is desirable for itself, it is not desirable for the sake of some other good, and all other goods are desirable for its sake.
Aristotle thinks everyone will agree that the terms “eudaimonia” (“happiness”) and “eu zên” (“living well”) designate such an end. The Greek term “eudaimon” is composed of two parts: “eu” means “well” and “daimon” means “divinity” or “spirit”. To be eudaimon is therefore to be living in a way that is well-favored by a god. But Aristotle never calls attention to this etymology in his ethical writings, and it seems to have little influence on his thinking. He regards “eudaimon” as a mere substitute for eu zên (“living well”). These terms play an evaluative role, and are not simply descriptions of someone's state of mind.
No one tries to live well for the sake of some further goal; rather, being eudaimon is the highest end, and all subordinate goals—health, wealth, and other such resources—are sought because they promote well-being, not because they are what well-being consists in. But unless we can determine which good or goods happiness consists in, it is of little use to acknowledge that it is the highest end. To resolve this issue, Aristotle asks what the ergon (“function”, “task”, “work”) of a human being is, and argues that it consists in activity of the rational part of the soul in accordance with virtue (1097b22–1098a20). One important component of this argument is expressed in terms of distinctions he makes in his psychological and biological works. The soul is analyzed into a connected series of capacities: the nutritive soul is responsible for growth and reproduction, the locomotive soul for motion, the perceptive soul for perception, and so on. The biological fact Aristotle makes use of is that human beings are the only species that has not only these lower capacities but a rational soul as well. The good of a human being must have something to do with being human; and what sets humanity off from other species, giving us the potential to live a better life, is our capacity to guide ourselves by using reason. If we use reason well, we live well as human beings; or, to be more precise, using reason well over the course of a full life is what happiness consists in. Doing anything well requires virtue or excellence, and therefore living well consists in activities caused by the rational soul in accordance with virtue or excellence.
He is happy who lives in accordance with complete virtue and is sufficiently equipped with external goods, not for some chance period but throughout a complete life. (Nicomachean Ethics, 1101a10)
Aristotle's conclusion about the nature of happiness is in a sense uniquely his own. No other writer or thinker had said precisely what he says about what it is to live well. But at the same time his view is not too distant from a common idea. As he himself points out, one traditional conception of happiness identifies it with virtue (1098b30–1). Aristotle's theory should be construed as a refinement of this position. He says, not that happiness is virtue, but that it is virtuous activity. Living well consists in doing something, not just being in a certain state or condition. It consists in those lifelong activities that actualize the virtues of the rational part of the soul.
...the function of man is to live a certain kind of life, and this activity implies a rational principle, and the function of a good man is the good and noble performance of these, and if any action is well performed it is performed in accord with the appropriate excellence: if this is the case, then happiness turns out to be an activity of the soul in accordance with virtue. (Nicomachean Ethics, 1098a13)
At the same time, Aristotle makes it clear that in order to be happy one must possess others goods as well—such goods as friends, wealth, and power. And one's happiness is endangered if one is severely lacking in certain advantages—if, for example, one is extremely ugly, or has lost children or good friends through death (1099a31–b6). But why so? If one's ultimate end should simply be virtuous activity, then why should it make any difference to one's happiness whether one has or lacks these other types of good? Aristotle's reply is that one's virtuous activity will be to some extent diminished or defective, if one lacks an adequate supply of other goods (1153b17–19). Someone who is friendless, childless, powerless, weak, and ugly will simply not be able to find many opportunities for virtuous activity over a long period of time, and what little he can accomplish will not be of great merit. To some extent, then, living well requires good fortune; happenstance can rob even the most excellent human beings of happiness. Nonetheless, Aristotle insists, the highest good, virtuous activity, is not something that comes to us by chance. Although we must be fortunate enough to have parents and fellow citizens who help us become virtuous, we ourselves share much of the responsibility for acquiring and exercising the virtues.
"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.
The Hierarchical View of Nature
In order to explain human happiness, Aristotle draws on a view of nature he derived from his biological investigations. If we look at nature, we notice that there are four different kinds of things that exist in the world, each one defined by a different purpose:
Mineral: rocks, metals and other lifeless things. The only goal which these things seek is to come to a rest. They are "beyond stupid" since they are inanimate objects with no soul
Vegetative: plants and other wildlife. Here we see a new kind of thing emerge,something which is alive. Because plants seek nourishment and growth, they have souls and can be even said to be satisfied when they attain these goals
Animal: all the creatures we study as belonging to the animal kingdom. Here we see a higher level of life emerge: animals seek pleasure and reproduction, and we can talk about a happy or sad dog, for example, to the extent that they are healthy and lead a pleasant life
Human: what is it that makes human beings different from the rest of the animal kingdom? Aristotle answers: Reason. Only humans are capable of acting according to principles, and in so doing taking responsibility for their choices. We can blame Johnny for stealing the candy since he knows it is wrong, but we wouldn't blame an animal since it doesn't know any better.
Happiness cannot be achieved until the end of one's life. Hence it is a goal and not a temporary state.
It seems that our unique function is to reason: by reasoning things out we attain our ends, solve our problems, and hence live a life that is qualitatively different in kind from plants or animals. The good for a human is different from the good for an animal because we have different capacities or potentialities. We have a rational capacity and the exercising of this capacity is thus the perfecting of our natures as human beings. For this reason, pleasure alone cannot constitute human happiness, for pleasure is what animals seek and human beings have higher capacities than animals. The goal is not to annihilate our physical urges, however, but rather to channel them in ways that are appropriate to our natures as rational animals.
Happiness is the perfection of human nature. Since man is a rational animal, human happiness depends on the exercise of his reason.