The Minister of Justice in Chen asked Confucius, “Did the Duke of Zhou know the rules of ritual?”

Confucius replied, “He did.”

After Confucius left, the minister bowed to his prince, Wuma Qi, and told him, “I have heard that a noble person is not biased, but maybe some are.

“The Duke of Zhou married a woman with the same clan, and justified it by saying that she came from ‘the Elder Family of Wu.’ If the Duke of Zhou knew the rules of ritual, then who doesn’t know them?”

Later, Wuma Qi told this to Confucius.

Confucius replied, “I’m a lucky man! When I make a mistake, other people always find out.”