Here is another very pertinent quote from the book "Science and Health with key to the Scripture" by Mary Baker Eddy.
Never fear the mental malpractitioner, the mental assassin, who, in attempting to rule mankind, tramples upon the Divine Principle of metaphysics, for God [1] is the only power.
Notes:
[1] Note that Mary Baker Eddy Properly defines her understanding of God as "Divine Principle, Life, Truth, Love, Soul, Spirit, Mind."