Tattvabodha is a 381-page text attributed to Śaṇkarācārya that introduces various teaching methods used in the Upaniṣads in a very concise and clear manner. It is the first book taught by Swami Dayananda in each of his 3-year residential Vedānta courses.  Tattvabodha unfolds the transformative vision of Vedānta, namely that you are already what you seek to become, while providing a strong foundation for further in-depth study.