The Untroubled Mind is written by Herbert J. Hall, a physician.
This book explores the effects of diseases on human health in proportionate to mind's conception of a disease.
The author humbly says, though many books on this subject have been written by experts, his writings will have its own audience who were unable to find those part or failed to receive from experts writings.
The author adds further that the readers might be annoyed with the unspecific nature or indirectness, however he reasons it saying, he does not believe rules must bind or final.