"The superior man is distressed by his want of ability; he is not distressed by men’s not knowing him."

"I will not be afflicted that men do not know me; I will be afflicted that I do not know men."

"You cannot open a book without learning something."

"To know what you know and what you do not know, that is true knowledge."

"He who speaks without modesty will find it difficult to make his words good."