1. The Bhagavad Gita refers to itself as an Upanishad.

2. The fairly long Chhandogya - upanishad develops the idea of transmigration of souls.

3. The Isha - upanishad emphasizes the identity of the human soul with the divine soul.

4. The Katha - upanishad, through the story of Nachiketa, discussed death and the permanence of the soul ( Atman ).

5. The Upanishad says, "The truth is above all and is the common foundation of conception."

6. To explore these theories will help us grasp more clearly the origination of the various theories of pluralistic realism of Indian philosophy after Upanishad.

7. They contain didactic stories, allegories, and passages for meditation, a number of which are repeated in more than one Upanishad or elsewhere in the Vedic corpus.

8. The term bhakti, in the sense of devotion to a personal god, appears in the Bhagavadgita and the Svetasvatara Upanishad.