Literature refers to the art that uses language and writing as a tool to vividly reflect objective reality, including drama, poetry, novels, prose, etc. It is an important form of expression of culture.
Psychology is a science that studies the occurrence, development and activity patterns of human and animal psychological phenomena.
The social and cultural phenomena to be expressed in literature are themselves psychological phenomena of humans and animals. One is the refinement of real life through personal art, and the other is the basic laws of real life. One is internal and the other is external.
Psychology originally came from philosophy, but philosophy and psychology are carriers that reflect the value and practical significance of literature.