The term "forbiden fruit" is a metaphor that describes any object of desire whose appeal is a direct result of the knowledge that it cannot or should not be obtained or something that someone may want but cannot have. The phrase refers to the Book of Genesis, where it is the fruit of the Tree of Knowledge of Good and Evil eaten by Adam and Eve in the Garden of Eden. As a result of their decision to eat the fruit, Adam and Eve lost their innocence (according to the Christian interpretation), became separated from God and were exiled from the garden where they were forced to adopt agriculture under less than desirable circumstances for a living. The concept of "knowing" good and evil can be best understood as being emotionally entangled with the struggle of determining the difference.