Since medicine began it has been recognized that there is a capacity for self healing within the human organism .In acute illness such as colds, chickenpox etc. the body naturally resists infection and  in  no time , gets better mobilizing its own defenses helped by rest, fresh air and the right food. In more long lasting chronic illness, such as repeated migraine or depression, the body’s viability is often too depleted to do this without assistance. In these cases the right remedy will stimulate the body `s self healing powers to start the process of cure.
Over many years this self healing power has been given various names in different cultures. It has been called “prana” in India “chi” in China and “vital force” in Europe. Researchers have attempted to localize it in what is called, in modern terminology, the immune system. It is not completely clear to anyone what exactly it is in us that heal disease though we often see demonstrations of its power.