"Approximately seven thousand years ago the Indo-Aryan people migrated to India where they made their permanent home and built a progressive community in the Gangatic valley under the shadow of the lofty Himalayas. The Upanishads are the quintessence of the philosophy and religion of these Aryan migrants. There are many translations of the Upanishads. In this little volume of the four Upanishads: Subala, Jabala, Pingala and Vajrasochika, I have presented interpretive commentary of the selected Sanskrit texts."