The second one: The Analects of Confucius: or: "How about good for good?" Confucius said, "How can I repay you? Direct complaints, good for good. "

Someone said, "How about repaying kindness with evil?" Confucius said, "What can I repay you? We must repay our grievances with integrity and repay our kindness. "

Ps: Ancient people's thoughts were mainly Confucianism. As early as the pre-Qin period, hundred schools of thought took Mohism and Confucianism as prominent scholars. To tell the truth, these two ideas are hard to teach people to retaliate. So, is it possible that the landlord made a mistake? This is just a personal impression.