I'm glad you asked.
Schooling and Society: The Politics of Education in Prussia and Bavaria 1750-1900 Karl Schleunes (Oxford: Berg, 1989). (ISBN 0-85496-267-0).
There are more good citations on the foundations of the current state-controlled school system where that citation came from.
http://learninfreedom.org/school_state.html
I'm glad you asked.
Schooling and Society: The Politics of Education in Prussia and Bavaria 1750-1900 Karl Schleunes (Oxford: Berg, 1989). (ISBN 0-85496-267-0).
There are more good citations on the foundations of the current state-controlled school system where that citation came from.
http://learninfreedom.org/school_state.html