"Real knowledge is to know the extent of one’s ignorance."
"Wisdom, compassion, and courage are the three universally recognized moral qualities of men."
"The man who moves a mountain begins by carrying away small stones."
"When we see men of a contrary character, we should turn inwards and examine ourselves."
"The superior man understands what is right; the inferior man understands what will sell."
"To know what is right and not do it is the worst cowardice."
"Learning without thought is labor lost; thought without learning is perilous."