In the present work, the author has made an endeavour to give a comprehensive idea of the concept of the Absolute-the personal Isvara and the impersonal Brahman-as found in twenty schools of Indian thought. In dealing with the subject, the author has always kept his eyes on matters found in the original texts, and has given exhaustive quotations from those texts to support any points coming in course of the discussions. This work is therefore expected to help the readers and researchers formulate the idea of the Absolute in the proper perspective.