Central Theme of the Upanishads Sri Shankaracharya and some of his modern followers take Monism or Atmaikya, and Absolutism or nirguNa-brahmavaada to be the central theme of Upanishads. Consequently, Idealism or the world being merely a projection, which is unreal, is also taken to be a tenet of the Upanishads. Thus upaasanaa (worship) and bhakti (devotion) are relegated to a secondary position, being needed only up to a point in the spiritual evolution of the soul. Liberation, the final goal of spiritual development becomes less attractive, as the seeker loses his own identity in his merger