Mencius - Book 2, Part 1, Chapter 9B

'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 neglected and left without office, he did not murmur. When straitened by poverty, he did not grieve. Accordingly, he had a saying,"You are you, and I am I. Although you stand by my side with breast and aims bare, or with your body naked, how can you defile me?"

'Therefore, self-possessed, he companied with men indifferently, at the same time not losing himself. When he wished to leave, if pressed to remain in office, he would remain. He would remain in office, when pressed to do so, not counting it required by his purity to go away.'

Mencius said, 'Po-î was narrow-minded, and Hûi of Liû-hsiâ was wanting in self-respect. The superior man will not manifest either narrow-mindedness, or the want of self-respect.'
~ James Legge translation via nothingistic.org ~

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