nine nights of navratri renew and purifies the individual conciousnessand the universal conciousness of creation DIVINE mother restore peace ASURAS are symbolic of negative forces NAVRATRI is the celebration of the prana which alone can destroy these asuras when u r full of enthusiasm and energy ; none of these asuras can be with u actually upavaas means sitting close to yourself u r in so much BLISS that u forget to eat and drink do it to purify body and mind so bad karmas and impression are washed away