The Borderline does not accept her own intelligence, attractiveness, or sensitivity as constant traits, but rather as comparative qualities to be continually re-earned and judged against others. For the Borderline, identity is graded on a curve. Who she is and what she does today determines her worth, with little regard to what has come before. The Borderline allows herself no laurels on which to rest. Like Sisyphus, she is doomed to roll the boulder repeatedly up the hill, needing to prove herself over and over again.
by Jerold Kreisman and Hal Straus ‘I Hate You—Don’t Leave Me: Understanding the Borderline Personality’