Full Idea
Knowledge is power. The devil it is! One man can have a great deal of knowledge without its giving him the least power, while another possesses supreme authority but next to no knowledge.
Gist of Idea
Knowledge is not power! Ignorant people possess supreme authority
Source
Arthur Schopenhauer (Parerga and Paralipomena [1851], III:43)
Book Reference
Schopenhauer,Arthur: 'Essays and Aphorisms [from Pand P]', ed/tr. Hollingdale,R.J. [Penguin 1970], p.125
A Reaction
He is referring to Bacon's famous adage. Bacon may be right about military affairs, but not about politics.