More than 200 Upanishads are known, of which the first dozen or so are the oldest and most important and are referred to as the principal or main (mukhya) Upanishads. The mukhya Upanishads are found mostly in the concluding part of the Brahmanas and Aranyakas and were, for centuries, memorized by each generation and passed down orally. The early Upanishads all predate the Common Era, five of them in all likelihood pre-Buddhist (6th century BCE), down to the Maurya period. Of the remainder, some...
More than 200 Upanishads are known, of which the first dozen or so are the oldest and most important and are referred to as the principal or main (...