Mandukyakarika, The Metaphysical Path of Vedanta
The Mandukya Upanisad, of great initiatory interest,  acquires greater value through the addition of Gaudapada's karika, some of  which are an integral part of the Upanisad.Gaudapada divides this work into four parts, naming them:1.  Agama Prakarana, based on the scriptures or Sruti.2.  Vaitathya Prakarana, based on the phenomenal or apparent character  of experience.3.  Advaita Prakarana, based on non-duality.4.  Alatasanti Prakarana, based on the extinction of the "burning  ember".In it He unveils for the first time, clearly and concisely, the Aspara  yoga or vada (path, way), the metaphysical yoga, the pathway which leads  not to union with the God-person, but to integral Liberation (Turiya).