Today begins a series of readings on the News and Updates page from Mrs. Eddy’s writings where she indicates what must come BEFORE “the understanding of Truth which destroys error” (252:8) and the “understanding of good”. (Mis 107:14-17) Take a look and see what she identifies as necessary for true, scientific healing.
BEFORE – 1
When false human beliefs learn even a little of their own falsity, they begin to disappear. A knowledge of error and of its operations must precede that understanding of Truth which destroys error, until the entire mortal, material error finally disappears, and the eternal verity, man created by and of Spirit, is understood and recognized as the true likeness of his Maker. (Eddy, Mary Baker, Science and Health With Key to the Scriptures, p.252:7-14)
WATCHKEEPERS 
My favorite citation after you pointed it out. And also what you mentioned in Prose Works.
I would have overlooked them.
Maybe the most important.
Thank you Frank.