“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.”

“When a person should be spoken with, and you don't speak with them, you lose them. When a person shouldn't be spoken with and you speak to them, you waste your breath. The wise do not lose people, nor do they waste their breath.”

“When you have faults, do not fear to abandon them.”

“You will never know how sharp a sword is unless it's drawn from its sheath”

“A youth is to be regarded with respect. How do we know that his future will not be equal to our present?”