“The mass of men lead lives of quiet desperation.  When we consider what, is the chief end of man, and what are the true necessaries and means of life, it appears as if men had deliberately chosen the common mode of living because they preferred it to any other.  Yet they honestly think there is no choice left.  But alert and healthy natures remember that the sun rose clear.  It is never too late to give up our prejudices.  No way of thinking or doing, however ancient, can be trusted without proof.  What everybody echoes or in silence passes by as true today may turn out to be falsehood tomorrow, mere smoke of opinion.”

“Confucious said, 'To know that we know what we know, and that we do not know what we do not know, that is true knowledge.”