Milton's notion of self-knowledge places him in the Socratic-Christian tradition which distinguishes between man's rational part, or self-like-God, and his passional nature, the aspect of self most easily subverted by Satan. Only the self-knowing man, by introspection and by seeing the reflection of self in the mirror of the world's stage, achieves a harmony between the two aspects of self. Milton's concept of self-examination, apparent in his prose and verse, is symbolically represented in Paradise Lost. The world of Adam-Eve mirrors both God's realm of pure truth and reason and Satan's realm of unreason and unrestrained passion. These realms represent those aspects of self that man must necessarily discover within. The Fall is inevitable and irrevocable in the creation of self: in Adam's discovery of his obligation to know himself “aright,” he understands that his rational self-like-God must rule the darker passionate self. Paradise Regained and Samson Agonistes also represent man as achieving self-knowledge by the twofold means of introspection and viewing the reflection of himself in the external world.