Tzu Chang asked Confucius about jen. Confucius said, "If you can practice these five things with all the people, you can be called jen." Tzu Chang asked what they were. Confucius said, "Courtesy, generosity, honesty, persistence, and kindness. If you are courteous, you will not be disrespected; if you are generous, you will gain everything. If you are honest, people will rely on you. If you are persistent you will get results. If you are kind, you can employ people.
Things being investigated, knowledge became complete. Their knowledge being complete, their thoughts were sincere. Their thoughts being sincere, their hearts were then rectified. Their hearts being rectified, their persons were cultivated. Their persons being cultivated, their families were regulated. Their families being regulated, their States were rightly governed. Their States being rightly governed, the whole kingdom was made tranquil and happy.
When a man comes to me, I accept him at his best, not at his worst. Why make so much ado? When a man washes his hands before paying a visit, and you receive him in that clean state, you do not thereby stand surety for his always having been clean in the past.
To know, is to know that you know nothing. That is the meaning of true knowledge. When you say something, say what you know. When you don't know something, say you don't know. That is knowledge.
Not to converse with a man worthy of conversation is to waste the man. To converse with a man not worthy of conversation is to waste words. The wise waste neither men nor words.