The Smarta Tradition accepts two concepts of Brahman, which are the saguna brahman - the Brahman with attributes, and nirguna brahman - the Brahman without attributes. The nirguna Brahman is the unchanging Reality, however, the saguna Brahman is posited as a means to realizing this nirguna Brahman. The concept of the saguna Brahman is considered in this tradition to be a useful symbolism and means for those who are still on their spiritual journey, but the saguna concept is abandoned by the fully enlightened once he or she realizes the identity of their own soul with that of the nirguna Brahman. A Smarta may choose any saguna deity (istadevata) such as Vishnu, Shiva, Shakti, Surya, Ganesha or any other, and this is viewed in Smarta Tradition as an interim step towards meditating on Om and true nature of supreme reality, thereby realizing the nirguna Brahman and its equivalence to one's own Atman, as in Advaita Vedanta.