This is the case with many learned persons; they have read themselves stupid. - Arthur Schopenhauer

To free a man from error is to give, not to take away. Knowledge that a thing is false is a truth. Error always does harm; sooner or later it will bring mischief to the man who harbors it. Then give up deceiving people; confess ignorance of what you don't know, and leave everyone to form his own articles of faith for himself. Perhaps they won't turn out so bad, especially as they'll rub one another's corners down, and mutually rectify mistakes. The existence of many views will at any rate lay a foundation of tolerance. Those who possess knowledge and capacity may betake themselves to the study of philosophy, or even in their own persons carry the history of philosophy a step further.

The discovery of truth is prevented more effectively, not by the false appearance things present and which mislead into error, not directly by weakness of the reasoning powers, but by preconceived opinion, by prejudice.

Man wolle nicht scheinen was man nicht ist. Das Vorgeben unbefangener Wahrheitsforschung, mit dem Entschluß, die Landesreligion zum Resultat, ja zum Maaßstabe und zur Kontrole derselben zu machen, ist unerträglich, und eine solche, an die Landesreligion, wie der Kettenhund an die Mauer, gebundene Philosophie ist nur das ärgerliche Zerrbild der höchsten und edelsten Bestrebung der Menschheit.