Mencius lived in an era when a hundred schools of thought contended, and "Yang Zhu's words prevailed in the world". Mencius criticized it fiercely from the standpoint of Confucianism. Mencius inherited and developed Confucius' thoughts and put forward a complete ideological system, which had a great influence on later generations and was regarded as the "sage" after Confucius.
Mencius inherited and developed Confucius' thought of ruling by virtue, and developed it into the theory of benevolent governance, which became the core of his political thought. He applied the principles of "pro" and "long" to politics, eased class contradictions and safeguarded the long-term interests of the feudal ruling class.
Mencius closely combined ethics with politics, emphasizing that moral cultivation is the basis of doing politics well. He said: "The foundation of the world is in the country, the foundation of the country is at home, and the foundation of the home is in the body." Later, the idea of "nourishing qi and calming the world" put forward by University was developed according to this idea of Mencius.
The highest category of Mencius' philosophical thought is heaven. Mencius inherited Confucius' thought of destiny, removed the residual meaning of personality god, and imagined heaven as a spiritual entity with moral attributes. He said: "Honest people, heaven is also." Mencius defined the moral concept of honesty as the essential attribute of heaven, and believed that heaven was the origin of the inherent moral concept of human nature. Mencius' ideological system, including his political thoughts and ethical thoughts, takes heaven as the category.