Practice is an organic dynamic system composed of various elements. It has three elements: practice subject, practice means and practice object. These three elements are interrelated and together constitute the whole practice. The basic characteristics of practice are: first, practice is objective.
Second, practice has initiative.
Third, practice has a social history.
Practice is very rich in content and varied in form. Production practice, social practice and scientific experiment are the three basic practical activities of human beings.
Practice is the source of knowledge. Dialectical materialism epistemology holds that human knowledge can only be produced on the basis of practice. Cognition is the reflection of the subject to the object, and the object is the object and content of cognition, and cognition cannot be formed by the object alone. The subjective ability is a necessary condition for the formation of cognition, but only the initiative of the subject will not produce cognition. Only in the practice of interaction between subject and object can knowledge be produced. Because only through practice can people's senses touch objects, so that objective things and phenomena can be reflected in people's minds; Only through practice and repeated interaction between subject and object can the essential characteristics of the object be gradually exposed and mastered by the subject. Therefore, practice is the source of knowledge. All scientific knowledge is a summary of people's practical experience and is obtained from practice.
Dialectical materialism epistemology emphasizes that knowledge comes from practice and does not rule out the importance of learning indirect experience. In fact, for a person, it is impossible to practice everything directly because of the limited scope of practice and the infinite diversity and eternal development of the objective world. The development of human cognition has inherent continuity and inheritance, and it is not necessary for a person to practice everything. Most of a person's experience is obtained indirectly through study. But it is an indirect experience for me, and it is a direct experience for others or predecessors. Generally speaking, all knowledge comes from practice. Practice is the source of knowledge, and indirect experience is the stream of knowledge. Therefore, we should not only study and study indirect experience hard, but also actively participate in practice.