What reasoning method did Mencius use to convince Liang in pot calling the kettle black?

It shows that Mencius used this metaphor to point out that there is no essential difference between Liang's immigration and famine policy and neighboring countries, in order to inspire Liang to implement the so-called "benevolent policy" and fundamentally govern the country. Later, people used the metaphor of "pot calling the kettle black" to illustrate that although the quantity and degree are different, the essence is the same thing and phenomenon.

Mencius advised Liang to practice benevolent government by analogy.

Liang Huiwang said to Mencius, "I really made great efforts to govern the country. When there was a famine in Hanoi, I moved the victims there to Hedong, and also transported some food from Hedong to Hanoi. If there is a famine in Hedong, I will do the same. I have observed the situation in neighboring countries, but I don't care about people as much as I do. However, the number of people in neighboring countries has not decreased, and my subjects have not increased. Why on earth? "

Mencius replied, "Your Majesty likes war. Please let me use the metaphor of war. The defeated beat drums and fought hand to hand. The defeated man dropped his helmet and dragged his weapon back to escape. He can't run a hundred paces in one breath, and some can't run fifty paces in one breath. Everyone who ran fifty paces laughed at him and said that he was too timid. What do you think? "

Liang Dao: "No, he who runs fifty paces is running even if he doesn't run a hundred paces." Mencius said, "If your majesty knew this, he would not expect to have more people than his neighbors."