This article proposes and defends a unified theory about the nature of consciousness: **The core of the soul is memory**. We not only demonstrate that the survival of memory determines the survival of the soul, but further reveal: **The content of memory determines the quality of the soul**. Morality, worldviews, and value judgments—these "core memories"—constitute the underlying code of the soul, and these memories can be shaped through life experiences, reflection, and active reconstruction. T