Why did Mary Baker Eddy repeatedly revise Science and Health?

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Mary Baker Eddy viewed Science and Health with Key to the Scriptures as the definitive textbook of her teachings on Christian Science. Throughout her life, she repeatedly revised the work to refine her statement of these teachings and to ensure it served as an accurate expression of her spiritual discovery.1

In 1883, she notably added the phrase "with Key to the Scriptures" to the title. This revision was intended to emphasize her conviction that the book did not stand alone but functioned as a guide to the continuing truth and power found in biblical revelation, particularly regarding the life and work of Jesus Christ.1