All normal individuals always play a certain role in social life, engage in such conscious and purposeful activities in their own posts, and act on society, thus leaving their own marks in the process of social and historical development. The development of society depends on the conscious efforts of all members of society. For example, Edison, a famous American inventor, left more than 1000 inventions for human society in his life. He made extraordinary contributions to social progress with his outstanding achievements in electric light, power supply system and movies.

Whether it is the practice of historical figures or the practice of ordinary individuals, it will always have a certain effect on social history more or less directly or indirectly. However, the role of individual activities in social and historical development cannot be the same. In nature, some people promote social development, while others hinder or even destroy social development. When individual activities conform to the law of social development and reflect the fundamental interests of the people, they can play a positive role in promoting social development and progress; On the contrary, it will hinder the development of society. For example, Comrade Mao Zedong combined the universal truth of Marxism-Leninism with the concrete practice of the China revolution, took the revolutionary road with China characteristics, and established a new socialist China through the hard struggle of China producers and the broad masses of the people. Because Mao Zedong's thoughts and activities conform to the laws of social development, represent the fundamental interests of the people in China, and have won the support of the broad masses of the people, which has greatly promoted the victory of the China revolution and social progress.