““An apparently old and often cited dictum extolling the superiority of scholars over statesmen was attributed to the legendary grammarian of the seventh century, Abû l-Aswad ad-Du- alî, and couched in this form: “There is nothing more powerful (a- azz) than knowledge. This is shown by the fact that kings exercise control (hukkâm) over people, and scholars exercise control over kings.” If the scholars themselves cannot be in positions of political power, then at least, the rulers should have knowledge. “Knowledge,” Aristotle says, “is an ornament of kings.” Again, Greek statecraft is transferred to Iran in the form of a statement ascribed to Anûsharwân: “When God means well for a nation, He places knowledge in its kings, and kingship in its scholars.” The concept of the philosopher-king appears in Muslim adab under the name of Diogenes. “Asked when the world was in good shape, Diogenes replied: When its kings philosophize, and its philosophers are kings.””
