“Without knowing the force of words, it is impossible to know more.”

“Without an acquaintance with the rules of propriety, it is impossible for the character to be established”

“He Who Knows And Knows That He Knows Is A Wise Man - Follow Him;He Who Knows Not And Knows Not That He Knows Not Is A Fool - Shun Him”

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

“When you know a thing, to hold that you know it; and when you do not know a thing, to allow that you do not know it--this is knowledge.”

“Worry not that no one knows you; seek to be worth knowing.”

“Real knowledge is to know the extent of one's ignorance.”