Mencius notes Sage Shun was barely distinguishable from mountain villagers at first. Yet upon encountering any kind word or virtuous act, his innate goodness surged forth irresistibly, showing how responsiveness to good differentiates sages from common folk.
Cao Jiao doubts he can become sage kings Yao and Shun due to his physique. Mencius argues sagehood relies on practicing filial piety rather than looks. The moral Way is an open road; one only fails to seek it, with teachers all around.