What "Christian Scientists" mean by "scientific certainty" is proof by "healing." Take the revered principle of cosmogony that "the moon is made of green cheese." If one who holds the doctrine, "heals" anybody, the proposition is "demonstrated." Mrs. Eddy's "scientific works" are all filled with this unanswerable logic. "Mortal Mind"--a thing which she utterly reprobates--may find difficulty in accepting the conclusion; but it is doubtless quite as well founded as most of the "healing" itself. Mrs. Eddy's own case is an illustration in point. A bed-ridden invalid for years, she was snatched from death, she has told us, by Dr. Quimby, and within a week of his first mental treatment she climbed to the top of a city hall. The writer has read a series of Mrs. Eddy's unpublished letters, which show that for some time she had varied nervous and spinal relapses. When not with Dr. Quimby, she wrote to him for "absent treatments," and sometimes _saw him appear to her_--or said she did--in response. Finally she was cured. Then she fell on an icy sidewalk, was nearly frightened to death, and wrote her letter beseeching Mr. Dresser to "undertake" for her. But, having been taught mind-healing by Dr. Quimby, she "demonstrated" over herself, and got up. The Doctor's original cure appears to have been so effective that her fall on the ice was mostly a jar of her imagination and a contusion on her veracity. For, in her _Retrospection and Introspection_, she solemnly affirms that her accident caused an injury far beyond the reach of "medicine" or "surgery," which she repaired by application of the Divine Spirit. This experience, says Mrs. Eddy ("scientist"), was a "falling apple of discovery" to her. Thereupon she went out into the wilderness of Boston--"withdrew," that is, from society--for three years--that she might search the Scriptures and find "Science."[23] At the end of her retirement, she had learned that "Mind reconstructs the body," and that "nothing else can." How it is done, she adds, "the Spiritual Science of Mind must reveal." Her charge for a course of ten lessons in this "divine science" was soon fixed at "only three hundred dollars."[24] Of the genuine original "Christian Science"--the sole and undivided "discovery" of Mrs. Mary Baker G. Eddy--she says: "I named it _Christian_ because it is compassionate, helpful, and spiritual. God I called _Immortal Mind_. That which sins, suffers, and dies, I named _mortal mind_. The physical senses, or sensuous nature, I called _error_ and _shadow_. Soul I denominated _Substance_, because Soul alone is truly substantial. God I characterized as individual entity, but his corporeality I denied. The Real I claimed as eternal; and its antipodes, or the temporal, I described as unreal. Spirit I called the _reality_; and matter, the _unreality_."[25]