Mencius - Book 3, Part 2, Chapter 1B

'Formerly, the officer Châo Chien made Wang Liang act as charioteer for his favorite Hsî, when, in the course of a whole day, they did not get a single bird. The favorite Hsî reported this result, saying, "He is the poorest charioteer in the world." Some one told this to Wang Liang, who said, "I beg leave to try again." By dint of pressing, this was accorded to him, when in one morning they got ten birds. The favourite, reporting this result, said, "He is the best charioteer in the world." Chien said, "I will make him always drive your chariot for you." When he told Wang Liang so, however, Liang refused, saying, "I drove for him, strictly observing the proper rules for driving, and in the whole day he did not get one bird. I drove for him so as deceitfully to intercept the birds, and in one morning he got ten. It is said in the Book of Poetry,

'There is no failure in the management of their horses;
The arrows are discharged surely, like the blows of an axe.'

I am not accustomed to drive for a mean man. I beg leave to decline the office."

'Thus this charioteer even was ashamed to bend improperly to the will of such an archer. Though, by bending to it, they would have caught birds and animals sufficient to form a hill, he would not do so. If I were to bend my principles and follow those princes, of what kind would my conduct be? And you are wrong. Never has a man who has bent himself been able to make others straight.'
~ James Legge translation via nothingistic.org ~

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