Confucius' educational ideal of "teaching without class" laid a solid theoretical foundation for the implementation of the imperial examination system in later generations. Confucius himself came from a humble background, and after he started his career, his disciples were all kinds. He advocates "regardless of class", that is, education can be given to all kinds of people, and emphasizes that education should be open to all kinds of people. Since all kinds of people can receive education, those who learn well can be qualified for certain official positions, which is equivalent to advocating that government positions should also be opened to the lower classes of society.