What is most opposed to the discovery of truth is not the false appearance that proceeds from things and leads to error, or even directly a weakness of the intellect. On the contrary, it is the preconceived opinion, the prejudice, which, as a spurious a priori, is opposed to truth. - Arthur Schopenhauer (Parerga and Paralipomena Quotes)

What is most opposed to the discovery of truth is not the false appearance that proceeds from things and leads to error, or even directly a weakness of the intellect. On the contrary, it is the preconceived opinion, the prejudice, which, as a spurious a priori, is opposed to truth.[Was der Auffindung der Wahrheit am meisten entgegensteht, ist nicht der aus den Dingen hervorgehende und zum Irrtum verleitende falsche Schein noch auch unmittelbar die Schwäche des Verstandes; sondern es ist die vorgefaßte Meinung, das Vorurteil, welches als ein After-a-priori der Wahrheit sich entgegenstellt.]

Source:(Clarendon Press, ed. 2000), Chapter I. On Philosophy and its Method, Section 17, Page 14
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