Mary Baker Eddy's book, Science and Health with Key to the Scriptures, includes the explanation of her discovery that the healings Jesus expected his followers to undertake are still possible now centuries later because of unchanging divine Principle.
The Church had its beginnings when it was voted in 1879 "To organize a church designed to commemorate the word and works of our Master, which should reinstate primitive Christianity and its lost element of healing." Later the Bible and Science and Health came to serve as the universal Pastor for the denomination.
Photo: Mary Baker Eddy. May 4, 1916. United States Library of Congress Prints and Photographs division, Washington DC. Accessed June 5th, 2019. URL: http://loc.gov/pictures/resource/cph.3a02009/