(1) When serving your parents, you can do your best; when you serve your king, you can do your best; when making friends, you must keep your word. Even though I say I haven’t learned yet, I will definitely call it learning.

——"The Analects of Confucius·Xueer"

(2) I have been determined to learn for ten years.

——"The Analects of Confucius·Wei Zheng"

(3) Zigong said: "Master's articles can be obtained and heard; Master's words and the way of heaven cannot be obtained and heard. Wen Ye."