Mencius - Book 5, Part 2, Chapter 1B

'Hûi of Liû-hsiâ was not ashamed to serve an impure prince, nor did he think it low to be an inferior officer. When advanced to employment, he did not conceal his virtue, but made it a point to carry out his principles. When dismissed and left without office, he did not murmur. When straitened by poverty, he did not grieve. When thrown into the company of village people, he was quite at ease and could not bear to leave them. He had a saying, "You are you, and I am I. Although you stand by my side with breast and arms bare, or with your body naked, how can you defile me?" Therefore when men now hear the character of Hûi of Liü-hsiâ, the mean become generous, and the niggardly become liberal.

'When Confucius was leaving Ch'î, he strained off with his hand the water in which his rice was being rinsed, took the rice, and went away. When he left Lû, he said, "I will set out by-and-by:" it was right he should leave the country of his parents in this way. When it was proper to go away quickly, he did so; when it was proper to delay, he did so; when it was proper to keep in retirement, he did so; when it was proper to go into office, he did so: this was Confucius.'
~ James Legge translation via nothingistic.org ~

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