Mencius - Book 2, Part 1, Chapter 1A

Kung-sun Ch'âu asked Mencius, saying, 'Master, if you were to obtain the ordering of the government in Ch'î, could you promise yourself to accomplish anew such results as those realized by Kwan Chung and Yen?'

Mencius said, 'You are indeed a true man of Ch'î. You know about Kwan Chung and Yen, and nothing more,

'Some one asked Tsang Hsî, saying, "Sir, to which do you give the superiority, to yourself or to Tsze-lû?" Tsang Hsî looked uneasy, and said, "He was an object of veneration to my grandfather." "Then," pursued the other, "Do you give the superiority to yourself or to Kwan Chung?" Tsang Hsî, flushed with anger and displeased, said, "How dare you compare me with Kwan Chung? Considering how entirely Kwan Chung possessed the confidence of his prince, how long he enjoyed the direction of the government of the State, and how low, after all, was what he accomplished, how is it that you liken me to him?"

'Thus,' concluded Mencius, 'Tsang Hsî would not play Kwan Chung, and is it what you desire for me that I should do so?'
~ James Legge translation via nothingistic.org ~

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