Chapter 7, Part 18 - Confucius

The Duke of Sheh asked Tsze-lu about Confucius, and Tsze-lu did not answer him.

The Master said, "Why did you not say to him, He is simply a man, who in his eager pursuit of knowledge forgets his food, who in the joy of its attainment forgets his sorrows, and who does not perceive that old age is coming on?"
~ James Legge translation via The Internet Classics Archive ~

Go here to read the introductory post to this serialized version of the Analects of Confucius.