How did Mencius use the example of a child near a well to explain compassion?

Mencius used the example of a child about to fall into a well to illustrate his belief that human nature is inherently good and possesses an innate sense of compassion. He argued that if anyone were to see a child in such immediate danger, they would instinctively experience a feeling of alarm and distress, followed by an urge to rescue the child.

Mencius contended that this spontaneous reaction does not arise from a desire for social recognition, a need to please parents or friends, or a fear of criticism. Instead, he identified this feeling of commiseration as one of the "four beginnings" (siduan)—the inborn moral seeds present in every human being. By highlighting this universal, uncalculated response, Mencius demonstrated that compassion is a fundamental aspect of human nature that, when properly cultivated, develops into the cardinal virtue of ren (human-heartedness).12