(Greek: psyche, mind; therapuo, cure)
Name for the process of using the mind to influence the body when ailing, and help to relieve it or cure it entirely.
It is no new thing, but as ancient as humanity; nor does it require any recondite knowledge or skill, since it is a matter of common experience.
There is a great deal of quackery masquerading under the name. Christian Science relies on the process to a great extent.
Unfortunately those who recommend and practise it do not believe in the existence of a soul as the principle of human life, but only in forces of one kind or other that constitute life.
New Catholic Dictionary