Again, every surgeon sees convincing proof in his daily experience, that the sensitiveness of his various patients varies so widely, that there must be some cause for it beyond that which is physical. There is no such wide diversity in the nerve-tissue of their system as can account for the extreme differences with which they not only manifest pain, but with which they doubtless feel it. The conclusion is, that though the transmission of pain is dependent on nerve-fibres only, its seat and origin are beyond, and are truly not physical at all. Pain is mental.
Editorials
Pain is Mental
From the August 1886 issue of The Christian Science Journal
Scientific American