Full Idea
The only virtue special to a ruler is practical wisdom.
Clarification
'Practical wisdom' is the Greek word 'phronesis'
Gist of Idea
The only virtue special to a ruler is practical wisdom
Source
Aristotle (Politics [c.332 BCE], 1277b27)
Book Reference
Aristotle: 'Politics', ed/tr. Sinclair,T.A. /Saunders,T. [Penguin 1992], p.182
A Reaction
If a person with wide social powers is to have practical wisdom, that will require extensive knowledge, in a way that local practical wisdom does not.