2. Labor is the first historical activity of human beings. (1) labor creates production tools. ② Labor promotes the generation of language and the generation and development of human consciousness. ③ Social relations between people are created and developed through labor.
3. Productive labor is the material basis for the existence and development of human society. Labor provides the necessary means of subsistence and production for the existence and development of human society, and provides material tools and means for all practical activities. It distinguishes and connects human society and nature, and becomes the practical basis of the unity of opposites between human society and nature.
4. Productive labor is the material source of all human social relations. People will inevitably form production relations in the process of labor, and people's social relations will be different with different working conditions. The development of labor determines the most basic social relationship, that is, the development of production relations, which is the basis of all other social relations.
All social phenomena, in the final analysis, are restricted by the degree of labor development. Productive labor breeds all the seeds of the future development of social organisms. The development of labor leads to the emergence of private ownership and alienation of labor, and the high development of labor will inevitably lead to the elimination of private ownership and the abandonment of alienated labor, thus realizing the liberation of labor, that is, the liberation of mankind. Therefore, Engels said: the history of labor development is the "key" to understand all the history of social development.
6. The mode of production of material materials is the decisive force of social development (1). As a mode of production with the unity of productivity and production relations, it is not only the bond of social and natural, but also the "skeleton" of the whole social organism. All other social activities are based on the mode of production. (2) The mode of production determines the social structure, nature and appearance. The mode of production of material life restricts the process of social life, political life and spiritual life of the whole society. Different modes of production determine different social forms. In the final analysis, the economic, political and spiritual outlook of the whole society is rooted in the mode of production. (3) The mode of production determines the change and replacement of social history. The basic principle of historical materialism that social existence determines social consciousness is mainly based on the basic fact that the mode of production of material materials is the decisive force of social development.