"The allness of Deity is His oneness," writes Mary Baker Eddy in "Science and Health with Key to the Scriptures" (p. 267). The logic of this statement is self-evident, if the allness of God is accepted. His oneness is its inevitable correlative. A denial of the second would be a contradiction of the first. Thus is God found to be one and indivisible.
Mrs. Eddy perceived Truth in its completeness. She saw with the logic of the spiritual seer that because God is All, His allness constitutes His oneness. She saw that there can be nothing separate from or outside of divine Being. She perceived the indivisible oneness of man with God, Mind, as Mind's idea. Mrs. Eddy saw this as divine reality, in its absoluteness; but she saw also that it can be made practical, available in human affairs. He who perceives this allness and oneness as the fact of creation, and identifies himself with it, lays hold of the truth and demonstrates it in daily living by healing sickness, destroying sin, eliminating fear, hatred, want, and finally by helping to establish the understanding of universal brotherhood.
In John's Gospel we find this prayer by Jesus (17:21): "That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us." Christian Science lifts the concept of oneness out of the elusive and the academic, and shows that it can be made practical in everyday life. This Science teaches that the claim of duality or divisibility—the claim that there is a secondary cause and effect—is without origin, and therefore without reality, though mortal illusion would have us believe otherwise.
