It is the fruit of the tree of the knowledge of good and evil, which means that it brings awareness of the opposites, the specific feature of consciousness. Thus, according to this myth… consciousness is the original sin.
Edinger identifies the tree’s fruit as the psychological symbol of ego-consciousness arising through awareness of opposites, making the Fall the mythic statement that consciousness itself is the original transgression.
, Ego and Archetype: Individuation and the Religious Function of the Psyche, 1972thesis