Thrasymachus, the Sight-lover

The aim of this paper is to explain why Thrasymachus, upon first appearing in Republic I, prohibits Socrates from defining justice as what is good. I argue that Thrasymachus views such definitions as equivocal, since he conceives of the good as relative: what is good must be good for someone. This relative conception of the good makes Thrasymachus similar to the sight-lovers, who believe in good things, which are relatively good, but deny the existence of the good itself, which is absolutely good. Understanding Thrasymachus as a sight-lover permits an illuminating reframing of his outlook and his significance for the larger project of the Republic.