Mencius differentiates heavenly moral ranks and secular official ranks. The ancients cultivated inner virtues naturally gaining status, while modern people practice morality only for office then abandon virtue, which will bring total loss in the end.
Mencius uses fish and bear paws to illustrate choosing righteousness over life. All people possess this innate moral dignity, seen in starving folks rejecting insulting food. Many lose their original conscience by accepting lavish wealth against moral principles.
Gaozi claims food and desire form human nature, benevolence springs from within while righteousness comes from external elders. Mencius refutes this with analogies, proving both virtues stem from inner moral hearts instead of outside stimuli.