Philosophy 200/300
Greek Philosophy 

Fall Quarter 2001

 
Andrew Mills' 
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A Recap of An Argument in Republic I

At 341a, Thrasymachus makes the following claim:

A ruler, insofar as he is a ruler, never makes errors and unerringly decrees what is best for himself, and this his subject must do. Rulers rule in order to further their own interests: they set up laws which, if the subject obeys them, serve the ruler’s interests, not the subject’s. (Think of a dictator who lays down laws which exploit his subjects for his own ends—he makes them fight in his wars, work in his mines, etc.) Given this conception of rulers, the subject who acts justly—that is, follows the laws and decrees of the ruler—acts so as to further the ruler’s interests.

Socrates now argues that no ruler can possible legislate in his own interest. Here’s the argument:

1. Every art (or craft) serves the interest of its subject.

2. Ruling is an art (or craft).

3. So, ruling serves the interest of its subject.

The argument is clearly valid, but we need to examine whether the premises are true. In particular, what should concern us is (1) and what "subject" means. We might say that (1) is a generalization from such examples as these: A physician’s business is to treat his patients

A groom’s business is to care for the horses

A shepherd’s business is to care for the sheep

These examples suggest the following conception of ‘subject’: S1. The subject of a craft is something upon which the craft is practiced. Yet if this is how to understand ‘subject’, then (1) is wrong. Why? Because there are crafts which do not serve the interests of their subjects. Chicken slaughtering is a craft and its subject, according to (S1), must be chickens. But chicken slaughtering does not serve the interests of chickens. Hangmen are craftsmen, and the subject of their craft are the people they execute, but this craft does not serve the interests of those people. More mundanely, the subject (in the sense of (S1)) of shoemaking is leather, wax, string, glue, and nails, but the shoemaker is not seeking to serve the interest of these raw materials, rather he is seeking to make shoes. So (1), where ‘subject’ is interpreted as in (S1), is simply false.

There is, though another definition of ‘subject’ which renders (1) true. To see this, consider what the jobs of these craftsmen are. It’s the doctor’s job to heal the sick and keep the healthy in continuing good health. The groom’s job is to groom the horse in his charge. The slaughterer’s job is to produce slaughtered animals. The shepherd’s job is to graze the sheep and keep the wolves away. And so on. Notice that in each case the interest of the craft is to bring about a state of affairs. And, importantly, in no case is that state of affairs the same as the craftsman looking after himself. Baldly put, the job description of these crafts never includes anything about looking after the craftsman himself. So instead of (S1) we have

S2. The subject of a craft is that product or state of affairs that the craft is meant to realize. With (S2) in hand, we can re-read premise (1) as (1*) Every craft is practiced with a view to producing a certain object or state of affairs, and those who practice the craft are, strictly speaking, interested only in producing that object or state of affairs. (1*) is plausible, if not true. It’s more or less the claim that every craft has a job description, and those who practice the craft are, strictly speaking, interested in filling the job description. The problem now is that if we understand (1) as (1*), we must revise our understanding of (3). (3) now becomes (3*) The job of ruling has a job description—that rulers are interested in bringing about a state of affairs—and those who rule are, strictly speaking, interested only in producing that state of affairs. But what is it that rulers do? What is the job description of ruling? Doctors heal the sick, slaughterers slaughter, grooms groom, shepherds herd sheep--and rulers rule. That is, being a ruler involves being the highest executive authority and administrating in some body politic. That’s the job description of ruling. But, and here’s the problem, this is too thin a job description for Plato’s needs. Both tyrants and selfless public servants are rulers in this sense—they both fit the job description—but tyrants serve their own interests and committed public servants serve their subjects’ interests. Look at it this way. What a doctor, a groom, a slaughterer and a shepherd are supposed to do is clearly implied by the meaning of "doctor", "groom", "slaughterer" and "shepherd". And what a ruler is supposed to do is similarly implied by the meaning of the word "ruler": to be a ruler is just to be the highest executive authority in a city. But this is too thin for Plato's needs, since from the meaning of "ruler" nothing follows as to whether or not a ruler is a generous or cruel to his subjects. So, even if we allow, as we must, that governing a city is a distinct job, and that it is implied by the very meaning of the word ‘ruler’, we still cannot get out of all that what Plato is after—namely, that the function of a ruler must be to look after the well-being of the governed.

(This analysis of what's going on is adapted from--and in parts just verbatim quotes of--George Nakhnikian, An Introduction to Philosophy (New York: Alfred A Knopf), 1967, pp.46-9)

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