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Why did Mary Baker Eddy add “with Key to the Scriptures” to the title Science and Health?

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The Mother Church at the Christian Science Center in Boston stands beside a large reflecting pool, with its domed roof and ornate facade visible under a partly cloudy sky. — Christian Science The Mother Church and reflecting pool, Christian Science Center, Boston.

Mary Baker Eddy added the phrase "with Key to the Scriptures" to the title of her primary work, Science and Health, in 1883.1

She made this addition to emphasize her contention that the book did not stand alone as a separate entity. Instead, she intended for the work to serve as a guide that opened the way to the continuing power and truth found within biblical revelation, particularly regarding the life and work of Jesus Christ. By framing the text as a "key," Eddy highlighted its role in helping readers interpret and apply the spiritual insights of the Bible to their own lives.12