Tripura Upanishad

The text is classified as a Shakta Upanishad and attached to the Rigveda. The Tripura Upanishad places the goddess Tripura Sundari as the ultimate Shakti (energy, power) of the universe. She is described as the supreme consciousness, above Bramha, Vishnu and Shiva. The text is one of the important texts of the Shakta tradition and notable for its theory of Tripura (literally "three cities") symbolizing the three roads of work, worship and wisdom.