Two important concepts from Advaita Vedanta are Satyam and Mitya, as they help explain what our true nature is and what has been super-imposed upon us.  Satyam is that which is real beyond the three  phases of time.  It is beyond time and space, eternal and permanent.  Mitya is neither truth, neither false, but it is an apparent reality that depends on Satyam for its existence.  And it is Impermanent.