Mencius - Book 2, Part 1, Chapter 2E

Kung-sun Ch'âu further asked, 'What do you mean by saying that you understand whatever words you hear?' Mencius replied, 'When words are one-sided, I know how the mind of the speaker is clouded over. When words are extravagant, I know how the mind is fallen and sunk. When words are all-depraved, I know how the mind has departed from principle. When words are evasive, I know how the mind is at its wit's end. These evils growing in the mind, do injury to government, and, displayed in th government, are hurtful to the conduct of affairs. When a Sage shall again arise, he will certainly follow my words.'

On this Ch'âu observed, 'Tsâi Wo and Tsze-kung were skilful in speaking. Zan Niû, the disciple Min, and Yen Yüan, while their words were good, were distinguished for their virtuous conduct. Confucius united the qualities of the disciples in himself, but still he said, "In the matter of speeches, I am not competent." Then, Master, have you attained to be a Sage?'

Mencius said, 'Oh! what words are these? Formerly Tsze-kung asked Confucius, saying, "Master, are you a Sage?" Confucius answered him, "A Sage is what I cannot rise to. I learn without satiety, and teach without being tired." Tsze-kung said, "You learn without satiety: that shows your wisdom. You teach without being tired: that shows your benevolence. Benevolent and wise: Master, you ARE a Sage." Now, since Confucius would not allow himself to be regarded as a Sage, what words were those?'
~ James Legge translation via nothingistic.org ~

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