Because he wants to enjoy the material energy, the conditioned soul is allowed to reside in Devi-dhama, the external energy, where the goddess Durga carries out the orders of the Supreme Lord as His maidservant. The material energy is called jagal-laksmi because she protects the bewildered conditioned souls. The goddess Durga is therefore known as the mother, and Lord Siva, her husband, is known as the father. Lord Siva and goddess Durga are therefore known as the material father and mother. Goddess Durga is so named because this material world is like a big fort where the conditioned soul is placed under her care. For material facilities, the conditioned soul tries to please the goddess Durga, and mother Durga supplies all kinds of material facilities. Because of this, the conditioned souls are allured and do not wish to leave the external energy. Consequently they are continuously making plans to live here peacefully and happily. Such is the material world.