When we govern our bodies by the understanding of this great Truth, that Spirit forms its own conditions of body, we shall be perfectly harmonious; we should not hold the body a seat of pain or pleasure, but be able to dictate terms to it, even as to a muscle that we admit is dependent on mind for its action. But to attain this government over the body requires more instruction and explanation than we have space for in this book; we always advance slowly with students, requiring them to digest one part of the science before giving out another, and so on. (Eddy, Mary Baker, Science and Health, 1st, ed., p.191)