On the 6 day of Navaratri chapters 9 & 10 of Devī Māhātmya are recited, in which the final battle between the Goddess and demons Śumbha & Niśumbha takes place - the battle between our limitless, divine self and attachments to “I” and “mine” represented by those two asuras. Before slaying Śumbha the Goddess withdraws the 8 Matrikas, Her expansions, within Herself, and thus shows Him and reminds us all that in reality it is She alone who does everything in the universe - for there is nothing that is not Her.