This book is a detailed study of the philosophical significance of the Upaniṣads. Govinda Gopal Mukhopadhyay, the author of the book, reconstructs the salient themes of the Upaniṣads in seven chapters: 1. The Problem of Reality, 2. The Problem of Knowledge, 3. The Preparation, 4. Contemplation, 5. The Synthetic Way, 6. The Analytic Way and 7.The Problem of Attainment. The first two chapters deal with the metaphysical and epistemological views of the Upaniṣads. The next four chapters present an analysis of the different methods of attaining the ultimate reality as prescribed in different Upaniṣads. The last chapter deals with the nature of the state where one attains the ultimate goal by contrasting the Upaniṣadic views with other alternative theories.