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The good thing about studying/listening Devi Mahatmya a number of occasions is given under:-

3 times-to do away with black magic
5 times-to do away with difficulties attributable to planets
Seven occasions – to do away with nice worry.
9 occasions – Peace,
Eleven occasions – to recover from worry of dying, attraction of the king
Twelve occasions – getting needs fulfilled and destruction of enemies
Fourteen occasions – to draw girls in addition to enemies
Fifteen occasions – Nice life and getting of wealth
Sixteen occasions – to get sons and grand sons
Seventeen occasions – to do away with worry of the King
Eighteen occasions – to get occult powers
Twenty occasions – For warfare to finish
Twenty-five occasions – To return out of jail
Hundred occasions – to do away with nice sorrow, banishment from caste, Lack of life, salvation
Hundred and eight occasions – Fulfilling any needed want
One thousand occasions – Goddess Mahalakshmi will go to him/her and he/she is going to get all wealth

Studying of Shree Durga Saptshati (Devi Mahatmay)

Chapter 1 (Madhu kaitabha samhaara) is to be learn for 1st day,
Chapter 2 via 4 (Mahishhasura samhaara) to be learn on 2nd day,
Chapter 5 and 6 (Dhuumralochana vadha) on the third day,
Chapter 7 (Chanda Munda vadha) on 4th day,
Chapter 8(Rakta biija samhaara) on fifth day,
Chapter 9 and 10 (Shumbha Nishumbha vadha) on sixth day,
Chapter 11(Reward of Narayani) on seventh day,
Chapter 12 (Phalastuti) on eighth day,
Chapter 13 (Blessings to Suratha and the Service provider)on ninth day
Chapter 14 (aparaadha xamaapaNa) on 10th day

Shree Durga Saptshati (Devi Mahatmaya): Symbolism of the three episodes

Coburn says:

“The sage’s three tales are allegories of outer and interior expertise, symbolized by the fierce battles the omnipotent Devi wages towards throngs of demonic foes. Her adversaries signify the all-too-human impulses arising from the pursuit of energy, possessions and pleasure, and from illusions of self-importance. Just like the battlefield of the Bhagavad Gita, the Devi Mahatmya’s killing grounds signify the sector of human consciousness … The Devi, personified as one supreme Goddess and lots of goddesses, confronts the demons of ego and dispels our mistaken concept of who we’re, for – paradoxically – it’s she who creates the misunderstanding within the first place, and she or he alone who awakens us to our true being.” Chapter 1, Chapter 4, chapter 5, chapter 11 describe the reward given to the good Goddess Yognindra, Goddess Chandi, who slayed Mahishasura, Goddess Adi-Shakti, the one who’s supply of all different Goddesses and energy inside all gods and Goddess Durga, who was born from mixed power of all Gods & Goddesses declares that Goddess Adi-shakti is Supreme of all and supply of all. In chapter 1, Lord Brahma even praises that the good Goddess has created every thing together with himself.