In this book the reader will find the Master Key to Self-Realization that is in the form of the methodical teaching of Shri Siddharameshwar Maharaj about Self-Knowledge and realization of Final Reality. The teaching contained in this text reflects the clear and direct language that was used by Shri Siddharameshwar Maharaj and that has been similarly used for expressing Advaita Vedanta teachings that have been passed down through the ages. The spiritual instruction contained in this book forms the foundation for understanding the Advaita teachings of Shri Ranjit Maharaj and Shri Nisargadatta Maharaj, and is consistent with the teachings of other great Masters such as Shri Ramana Maharshi, Shri Adi Shankaracharya, and Saint Shri Samartha Ramdas, among others. May the one reading these words attain the realization of the Final Reality with the aid of this text by the Grace of the Sadguru, who is your own True Self. Jai Sadguru Parabrahman