▁practical ▁application ▁of ▁a ▁Lock e an ▁and ▁F ichte an ▁approach ▁to ▁the ▁problem ▁of ▁cogn ition ▁due ▁to ▁subject / object ▁or ▁observer / ob ser ved , ▁to ▁the ▁problem ▁of ▁the ▁relationship ▁between ▁qual itative ▁and ▁quant itative , ▁and ▁also ▁to ▁the ▁very ▁problem ▁of ▁life ▁itself . ▁" B run onian ▁doctrine ▁therefore ▁ful filled ▁Er hard ' s ▁call ▁for ▁a ▁medical ▁practice ▁based ▁on ▁the ▁" real " ▁causes ▁of ▁disease ▁rather ▁than ▁on ▁div ination ▁of ▁the ▁meaning ▁of ▁sympt oms . ▁... ▁where ▁Er hard ▁had ▁offered ▁only ▁criticism , ▁Brun onian ism ▁offered ▁an ▁alternative . ▁Brun onian ism ▁now ▁stood ▁ready ▁to ▁complete ▁what ▁Er hard ▁had ▁begun , ▁and ▁to ▁inaugur ate ▁a ▁revolution ▁in ▁German ▁medicine ." ▁ ▁Rö sch la ub ▁and ▁the ▁general ▁theory ▁of ▁disturb ance ▁and ▁dis order ▁ ▁Through ▁Rö sch la ub ’ s ▁writ ings , ▁mainly ▁between ▁ 1 7 9 5 ▁and ▁ 1 8 0 6 , ▁Brown ’ s ▁conception ▁of ▁life ▁was ▁brought ▁out : ▁as ▁a ▁potential ▁in ▁us ▁that ▁is ▁brought ▁into ▁action ▁and ▁reality ▁as ▁a ▁result ▁of ▁the ▁work ings ▁of ▁the ▁actual ▁( ex c itants ▁or ▁stim ul ants ) ▁on ▁us , ▁and ▁of ▁the ▁living ▁principle ▁as ▁a ▁re cept ive ▁potential ity ▁( ‘ ex cit ability ’ , ▁or ▁the ▁capacity ▁to ▁be ▁imp ing ed ▁upon ) ▁and ▁pro - active ▁( ‘ ex c itement