When Yanzi of Qi went as an envoy to Chu, the people of Chu made a small door for him beside the great gate, because he was short. Yanzi would not enter. “Those sent to a country of dogs go in by the dogs’ gate. I have been sent to Chu, so I should not go in by this gate.” He was led in through the main gate.
On another visit, the King of Chu planned to humiliate him. During a banquet, officers brought in a bound man and said he was from Qi and had stolen. The king asked Yanzi: “Do the people of Qi steal by nature?”
Yanzi answered that an orange grown south of the Huai River is an orange, but grown north of it becomes a bitter orange. People of Qi do not steal at home. “Could it be that the soil and water of Chu make people good at stealing?” The king laughed: “A sage is not a man to joke with. I have brought the shame on myself.”