If you let people follow their feelings, they will be able to do good. This is what is meant by saying that human nature is good.
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About Mencius
Mencius was confucian philosopher (c. 371 – c. 289 bc). Mencius, born Meng Ke (孟軻), was a Chinese Confucian philosopher, often described as the Second Sage (亞聖) to reflect his traditional esteem relative to Confucius himself. He was part of Confucius's fourth generation of disciples, inheriting his ideology and developing it further. Read more on Wikipedia →