When she wrote this little biography her great life-work had already been achieved, she was become renowned; to multitudes of reverent disciples she was a sacred personage, a familiar of God, and His inspired channel of communication with the human race.

Also, to them these following things were facts, and not doubted: She had written a Bible in middle age, and had published it; she had recast it, enlarged it, and published it again; she had not stopped there, but had enlarged it further, polished its phrasing, improved its form, and published it yet again.

It was at last become a compact, grammatical, dignified, and workman-like body of literature.

This was good training, persistent training; and in all arts it is training that brings the art to perfection.

We are now confronted with one of the most teasing and baffling riddles of Mrs.Eddy's history--a riddle which may be formulated thus: How is it that a primitive literary gun which began as a hundred-yard flint-lock smooth-bore muzzle-loader, and in the course of forty years has acquired one notable improvement after another--percussion cap; fixed cartridge; rifled barrel; efficiency at half a mile how is it that such a gun, sufficiently good on an elephant hunt (Christian Science) from the beginning, and growing better and better all the time during forty years, has always collapsed back to its original flint-lock estate the moment the huntress trained it on any other creature than an elephant?
Something more than a generation ago Mrs.Eddy went out with her flint-lock on the rabbit range; and this was a part of the result: "After his decease, and a severe casualty deemed fatal by skilful physicians, we discovered that the Principle of all healing and the law that governs it is God, a divine Principle, and a spiritual not material law, and regained health."-- Preface to Science and Health, first revision, 1883.
N.B.Not from the book itself; from the Preface.
You will notice the awkwardness of that English.