Tonic and Pathic

Like everything in life, disease has as well a dual nature. Disease can be split into diseases which are constant in nature and into those which have a variable nature.
Constant diseases are those like mumps, measles, chickenpox, small pox, fear, guilt, anger, grief etc.
these diseases are constant, and always the same in their appearance and set like Hahnemann would say the "tone" of the disease. And these "tone" setting diseases are called tonic diseases.
The pathic and variable diseases are those which vary in their appearance and expression.
Every tonic (causal) disease has the ability to create an offspring which have a variable appearance and cause different pathological symptoms (pathic).
For example: children with chicken pox have all the same tonic disease, but can all have different pathic diseases, one is very clingy and weepy, the other one is very itchy and worse with heat and hot bath, another one has sore joints and muscles. All of these children have chickenpox, and the same tonic disease, but all have a different pathic disease.
Hence the treatment of these two diseases warrant the use of two different remedies, one for the tonic disease and one for the pathic disease.
If the tonic disease underneath is not being treated and only the pathic is, then the underlying tonic will not have been cured and will continue to produce new pathic diseases. For example: the child with chickenpox (variolinum disease) and the pathic Pulsatilla disease will continue to have the variolinum disease even if the child was treated for the Pulsatilla symptom picture, the remedy can't touch the underlying variolinum disease and hence this underlying tonic disease will continue to live and produce new pathic disease offspring’s.