("the representative of the outer world to the id") In other words, the ego represents and enforces the reality principle. It is oriented towards perceptions in the real world and associated with reason and sanity. The ego, however, is never able fully to distinguish itself from the id, of which the ego is, in fact, a part, which is why Freud does not provide a hard separation between the ego and the id. (The ego could also be said to be a defense against the superego and its ability to drive the individual subject towards inaction or suicide as a result of crippling guilt. Freud sometimes represents the ego as continually struggling to defend itself from three dangers or master: "from the external world, from the libido of the id, and from the severity of the super-ego")