— The "Devi Upanishad" in its explanation of the theology of Shaktism, mentions and praises Shiva such as in its verse 19. Shiva, along with Vishnu, is a revered god in the "Devi Mahatmya", a text of Shaktism considered by the tradition to be as important as the "Bhagavad Gita". The Ardhanarisvara concept co-mingles god Shiva and goddess Shakti by presenting an icon that is half-man and half woman, a representation and theme of union found in many Hindu texts and temples.