CHRISTIAN SCIENCE is precise and demonstrable, because it is based on statements and laws that are fundamental, exact, and unalterable. One of these foundational precepts is the allness of Spirit and the consequent nothingness of that which seems to be matter.
God is Spirit; hence Spirit is All, infinite, omnipresent, omnipotent, omniscient. This is the teaching of Mrs. Eddy in her book Science and Health. It is set forth particularly on page 468 in "the scientific statement of being," which begins: "There is no life, truth, intelligence, nor substance in matter. All is infinite Mind and its infinite manifestation, for God is All-in-all." This position is supported by Jesus' statement to the Samaritan woman at Jacob's well when he declared, "God is a Spirit: and they that worship him must worship him in spirit and in truth" (John 4:24), and in his declaration to his disciples, "It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life" (John 6:63).
As one accepts this position as basic and unalterable the next step is unavoidable, that is, to see that the sensations and inharmonies of matter are unreal—illusory states of thought. He now realizes that mankind does not suffer from sick or inharmonious matter; he suffers only from the mesmeric belief that there is matter to be sick or inharmonious. This suggestion of suffering matter is only a belief and can be corrected. As truth is poured into consciousness, the belief in the reality of matter is eliminated, and with the belief goes the sense of suffering or inharmony, for they are inseparable from the belief. Mrs. Eddy sets this rule before us (Science and Health, p. 184): "Belief produces the results of belief, and the penalties it affixes last so long as the belief and are inseparable from it."
