Spiritual Philosophy of the Upanishads:
Towards the end of the later Vedic phase, a new trend is visible. The Upanishads do not deal with rituals or sacrifices. They deal with the higher knowledge and explain the relationship between Jeeva (individual soul) and Brahma ( Supreme Soul or ***). A major concept of the Upanishads is “the essential unity of all religions, of all spiritual paths.” The Truth is One, the wise call it by many names.