Excerpt from Science and Health by Mary Baker Eddy
The body is supposed to say, "I am ill." The reports of sickness may form a coalition with the reports of sin, and say, "I am malice, lust, appetite envy, hate." What renders both sin and sickness difficult to cure is, that the human mind is the sinner, disinclined to self-correction, and believing that the body can be sick independently of mortal mind and that the divine Mind has no jurisdiction over the body.
Why pray for recovery of the sick, if you are without faith in God's willingness and ability to heal them? If you do believe in God, why do you substitute drugs for the Almighty's power, and employ means which lead only into material ways of obtaining help, instead of turning in time of need to God, divine Love, who is an ever-present hell?
The Scriptures say, "They that wait upon the Lord…shall run, and not be weary, and they shall walk, and not faint." The meaning of the passage is not perverted by applying it literally to moments of fatigue, for the moral and physical are as one in their results. When we wake to the truth of being, all disease, pain, weakness, weariness, sorrow, sin, death, will be unknown, and the mortal dream will forever cease.
From Science and Help with Key to the Scriptures, by Mary Baker Eddy
(First Church of Christ, Scientist, 1903)