"I hope we still have some bright twelve-year-olds who are interested in science . We must be careful not to discourage o..."

"Men are four: He who knows not and knows not he knows not, he is a fool—shun him; He who knows not and knows he knows ..."

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