First of all, matter exists objectively and does not depend on human consciousness. It is the foundation of all existence, including the human body, everything in nature, and the productivity and production relations of human society. Without matter, there is no consciousness and the possibility of existence.
Secondly, consciousness is a reflection of matter in the human brain and a unique spiritual activity of human beings. Consciousness can be understood as the subject's cognition and perception of the object, including feeling, perception, thinking and imagination. Consciousness can reflect the characteristics and laws of matter, but it can also react to matter.
Finally, spirit reacts on matter, that is to say, consciousness can affect the development and change of matter. For example, people's consciousness can affect their behavior and lifestyle, thus affecting the natural environment and social development; The consciousness of enterprises can affect the management of enterprises, thus affecting the development and competition of enterprises; A country's consciousness can affect its policies and laws, thus affecting the progress and development of the whole country.
Therefore, the phrase "material is the basis of spirit, and spirit reacts on material" means that material is the basis of consciousness and existence, and consciousness can react on material and affect its development and change. This is one of the basic principles of dialectical materialism, which emphasizes the interaction between matter and consciousness.