妻止之曰：“特與嬰兒戲耳?！?br />曾子曰：“嬰兒非也戲也！嬰兒非有知也，待父母而學者也，聽父母之教。今子欺之，是教子欺也。母欺子，子而不信其母，非以成教也?！?br />遂烹彘也。
Why Zeng Shen Killed the Pig
One day, when Zeng Shen's wife was going to the market, their son cried and clamoured to go with her.
"Go back now!" she wheedled him. "When I get home we'll kill the pig for you."
Upon her return, she found Zeng Shen about to kill the pig. She hastily stopped him.
"I didn't really mean it," she protested. "I just said that to keep the boy quiet."
"How can you deceive a child like that?" asked Zeng Shen. "Children know nothing to begin with, but they copy their parents and learn from them. When you cheat the boy, you are teaching him to lie. If a mother deceives her child, he will not trust her, and that is no way to bring him up."
So he killed the pig after all.
Han Fei Zi