▁und ue ▁excess ▁or ▁defect ▁of ▁excitement ▁is ▁the ▁consequence ... "), ▁or ▁his ▁reference ▁to ▁a ▁pro - cre ative ▁as ▁well ▁as ▁sust aining ▁power ▁as ▁in ▁C CC XX VI ▁( “ every ▁living ▁system ▁lives ▁in ▁that ▁which ▁it ▁pro cre ates … that ▁the ▁system ▁of ▁nature ▁remains ▁and ▁maintain s ▁an ▁et ernal ▁vig our ” ). ▁ ▁When ▁added ▁to ▁his ▁distinction ▁between ▁benef icial ▁( ‘ ag ree able ’ ) ▁and ▁harm ful ▁( m align ities ) ▁‘ ex c itants ’ , ▁Brown ▁provided ▁the ▁basis ▁for ▁understanding ▁how ▁the ▁level ▁of ▁exc it ability / inc it ability ▁( pot ential ) ▁can ▁be ▁shift ed ▁up wards ▁( pot enti ated ). ▁Finally , ▁Brown ▁introduced ▁the ▁powerful ▁idea ▁that ▁path ology ▁( un he alth y ▁function ) ▁was ▁simply ▁phys i ology ▁( he alth y ▁function ) ▁extended ▁beyond ▁a ▁certain ▁range ▁of ▁sust ain able ▁vari ability ▁or ▁p uls ation ▁( a ▁function ▁of ▁the ▁polar ities ▁that ▁const itute ▁life ). ▁ ▁Rö sch la ub ▁worked ▁initially ▁with ▁F ichte an ▁ins ights ▁and ▁then ▁Sch elling ▁and ▁his ▁Natur ph il osoph ie , ▁establish ing ▁a ▁dynamic ▁philosoph ical ▁basis ▁in ▁natural ▁science ▁for ▁medicine . ▁However , ▁he ▁realized ▁that ▁medicine ▁could ▁not ▁be ▁restricted ▁to ▁natural ▁science , ▁even ▁a ▁dynamic ▁science ▁ground ed ▁in ▁phys i ology ▁( the ▁germ ▁of ▁which ▁was ▁provided ▁by ▁Dr . ▁Richard