N OUR DAY it a commonplace in political science and the history of political thought to draw a number of sharp distinctions. Among our most cherished distinctions are those between and practice, thought and action, is and ought, fact and value, normative and descriptive discourse, analytic and propositions, philosophy and science. Quite often, in order to gain a historical purchase on these distinctions, we look back to the beginnings of political philosophy. There we find, quite conveniently all too conveniently, I suspect the once-living personification, the very embodiment, of our own cherished distinctions. Plato, we are told, was the first political philosopher, Aristotle the first political scientist. Of course, the difference not usually stated so baldly, but more often subtle and indirect. Thus one may choose to look at their respective methods of inquiry, finding that Plato was given to a priori postulation and deductive theorizing, while Aristotle employed inductive methods of inquiry. Plato's method yields but merely analytic truth, i.e., that which necessarily certain because of the linguistic conventions governing the use of key terms and propositions.' Aristotle's method, by contrast, yields testable empirical propositions which disclose synthetic truth. It would not be difficult to continue drawing out such distinctions between Plato and Aristotle, cast in a modern idiom which would be incomprehensible (not to say silly) to them. I shall attempt something else instead. My aim in this essay will not be to spell out the differences between the two thinkers, using my own language as a yardstick to measure their differences (nor to hit them with either, for that matter). Instead I shall, in a rather roundabout fashion, attempt to spell out the character of their differences. And, since there are too many varieties of difference between them to treat in an essay of this length, I shall concentrate most of my attention on a matter which has been of perennial interest to political theorists: the problem of the relationship between theory and practice. How did each conceive of theory? Of practice? Did one have anything to do with the other, and if so, what was the character of this relationship as they saw it? These are the sorts of questions that will inform and guide my inquiry.
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