Rationality in Plato’s Republic

Abstract

This paper distinguishes six elements in the Platonic concept of rationality as it appears in the Republic: (a) being fully informed; (b) thinking logically; (c) having the single correct ultimate end; (d) determining the appropriate means; (e) matching action to thought; and (f) promoting one's own interest. The evidence linking the rational part of the soul (the logistikon) to each of these aspects is discussed. The philosopher-guardians are shown to exemplify fuH and complete "Platonic rationality", whereas the unjust men in books 8 and 9 exhibit different degrees of failure to conform to the six elements listed above.