Mencius - Book 4, Part 2, Chapter 29A

Yü and Chî, in an age when the world was being brought back to order, thrice passed their doors without entering them. Confucius praised them.

The disciple Yen, in an age of disorder, dwelt in a mean narrow lane, having his single bamboo-cup of rice, and his single gourd-dish of water; other men could not have endured the distress, but he did not allow his joy to be affected by it. Confucius praised him.

Mencius said, 'Yü, Chî, and Yen Hûi agreed in the principle of their conduct.
~ James Legge translation via nothingistic.org ~

Go here to read the introductory post to this serialized version of the Works of Mencius.