Begins Accepting Disciples, Establishes Innate Goodness Theory
Context: Mencius in his early thirties; his thought maturing, he began teaching disciples in the Zou-Lu region.
Decision: Systematically expounded the four sprouts theory, using the hearts of compassion, shame, modesty, and right-and-wrong as proof of innate human goodness.
Reasoning: If human nature were inherently bad (as Gaozi argued), benevolent governance would have no foothold; only if human nature is inherently good does benevolent governance have an internal basis.
Outcome: Innate goodness theory became the cornerstone of Mencius's philosophy, contrasting sharply with Gaozi's and Xunzi's views on human nature, influencing Confucianism for two thousand years.
Lesson: The choice of theoretical foundation determines practical direction: one's judgment about human nature directly shapes the path of political philosophy.