When a person falls ill, it is only this spiritual,self acting ( automatic) viatal force, everywhere present in his organism ,this is primarily deranged by the dynamic  influence upon it of a morbific agent inimical to life;it is only the vital principal,deranged to such an abnormal state,that can furnish the organism with its disagreeable sensations, and incline it to the irregular processes which we call disease;for, as a power invisible in itself, and only cognized by its effects on the organism, its ,orbid derangement only makes itself known by the manifestation of disease  in the sensations and functions of those parts of the organismexposed to senses of the observer and physician , that is, by morbid symptoms, and in no other way can it make itself  known."

Dynamics  means Physical power  and forces., potentials , influence on others ( In urdu asar- aafrini )

"What is Dynamic influence, - dynamic power? Our earth , by virtue of  a hidden invisible  energy, carries the moon  around her in 28 days  and several hours , and the moon alternately , in definite fixed hours raises our northern seas to flood tide and agin correspondingly  lowers  them to ebb. Apparently  this takes takes place not through material agencies,not through  mechanical contrivances , as are used  for products of  human labor; and so we  see  numourous other events about us as results of  the actions of  one substance  on other substance without being able  to recognize a sensible  connection  between  cause and effect .Only the cultured ,practised in comparison and deduction , can form  for himself  a kinfd of  supra-sensual idea sufficient to keep all that is material or mechanical  in his thoughts  from such concepts . He calls such effects  Dynamic,Virtual , that is, such  results  from  absolute , specific, pure energy and action of the one substance upon the other  substance.

For instance , the Dynamic effect of the sick-making influences upon the healthy man,as well as the Dynamic  energy of the medicines upon the principle of life in the restoration of health is nothong else than infection and so not  in any way material , not in  any way machenical. Just  as the energy of a magnet attracting a piece of iron or steel is not  not material, not mechanical.One sees the piece of iron is attracted  by one pole of the magnet,but how  it is done is not seen . The  invisible energy  of the magnet  does not require mechanical( material) auxiliary means , hook or lever , to attract of the iron . The magnet  draws to itself  and this acts upon the piece of iron or steel  needle  by means  of a purely immaterial , invisible,conceptual,inherent energy , that is , Dynamic Ally , and communicates to the steel needle  the magnetic energy  equally invisibly( Dynamicaly). In a similar way ,the effects of  medicines  upon living man is to be judged."