The Bible tells us that God is infinite, All; hence One. Mankind generally accepts the teaching of the infinitude of God, but does not apply the word all in its full meaning. Only Mary Baker Eddy, the Discoverer and Founder of Christian Science, reasoned logically from this premise to its only possible conclusion, namely, that God being infinite, whatever is unlike Him cannot and does not really exist. In the textbook, "Science and Health with Key to the Scriptures," she says on page 267, "The allness of Deity is His oneness;" and on page 469 she says, "We bury the sense of infinitude, when we admit that, although God is infinite, evil has a place in this infinity, for evil can have no place, where all space is filled with God."
The Bible calls God Spirit, Mind; and Christian Science teaching and practice are based upon the fact that Mind is God and there is therefore only one Mind, God, good. In the infinitude of Spirit no place is left for something besides God. Mind, Spirit, or intelligence, is ever active and manifests itself in man, who is the expression of God's nature. God needs man to witness to Himself. Man is the compound idea, through which Mind manifests itself. Man's life is God; man's intelligence is God; man's substance is God. Man is never separated from his eternal source, infinite Mind; he is never forgotten by God; he can lose neither his life nor his identity, because he is eternally emanating from and existing in Mind. He has no life, no intelligence, no will of his own, but unfolds God's glory and dominion.
Perceiving spiritual man, one sees the Father reflected. Jesus said, "He that hath seen me hath seen the Father" (John 14:9). But these facts, so evident to spiritual sense, find no support in the material seeming. The contrary seems to be true. There seem to be not one God but many gods, not one Mind but many minds, not one power but many powers, not one harmonious divine design but many human plans and wills, opposing one another. Mortals believe themselves to be separated from God. A mortal thinks that he has a life and intelligence of his own, that he moves in an orbit of his own, separated from God and his fellow men.