"To know one's ignorance is the best part of knowledge. To be ignorant of such knowledge is a disease. If one only regard..."

"Nicht vor Irrthum zu bewahren, ist die Pflicht des Menschenerziehers, sondern den Irrenten zu leiten, ja, ihn seinen Irr..."

"Every stage of education begins with childhood. That is why the most educated person on earth so much resembles a child..."