Gunas are our innate qualities that can be refined through the Divine consciousness. This Mother Divine is a symbolization of the creation, and the entire creation is made up of five elements. The Devi is Trigunatmika – the owner and master of the three Gunas. She is the storehouse of good qualities.
The qualities of Sattva, Rajas, and Tamas dominate during Navratri.
The first three days are attributed to Tamas and the Devi is honored in the form of Durga. Worshipping Devi Durga during the first three days brings a balance to the Tamasic tendencies.
The next three days of Navratri are attributed to Rajas and the Devi is honored in the form of Lakshmi. Worshipping Devi Lakshmi brings balance to the Rajasic tendencies.
The last three days of Navratri are attributed to Sattva where the Devi is honored in the form of Saraswati. Worshipping Devi Saraswati enhances the Sattva in us. During Navratri, our consciousness sails through Tamas, Rajas and blossoms in the Sattva Guna on the last three days.
Gaining victory over the three Gunas (through worship and spiritual practices) and being centered is the purpose behind the celebration of Navratri.