Our thoughts affect our bodies. Happiness produces a smile, sadness produces tears. Stress, anger, and hate produce physical, even organic, troubles. These phenomena are generally well known.
But looking even more deeply into these things, one finds that not only does thought have an influence on the body, but that the body is the objectification of thought. Bodily conditions are the outward appearing of thoughts that we entertain consciously, as well as concepts and fears that we may harbor without being aware of them.
This is true of pain as well. As physical as it may seem, pain actually objectifies mistaken thoughts—fears and materialistic concepts about life and about what governs us. The reason we know these thoughts are mistaken is that they produce problems. True ideas about God and His goodness produce harmony in our lives. Unreal, mistaken beliefs cause trouble. Correcting these mistaken thoughts is what brings healing.