“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.” — Confucius · Analects, 2.17
“The man who learns but does not think is lost. The man who thinks but does not learn is in great danger.” — Confucius · Analects, 2.15
“The superior man is satisfied and composed; the mean man is always full of distress.” — Confucius · The Analects, Book VII
“Our greatest glory is not in never falling, but in rising every time we fall.” — Confucius · Widely attributed to Confucius
“He who learns but does not think is lost. He who thinks but does not learn is in great danger.” — Confucius · The Analects, Book II