, ▁and ▁de human ising . ▁' lab our ▁is ▁external ▁to ▁the ▁worker ▁– ▁i . e ., ▁does ▁not ▁belong ▁to ▁his ▁essential ▁being ; ▁that ▁he , ▁therefore , ▁does ▁not ▁confirm ▁himself ▁in ▁his ▁work , ▁but ▁den ies ▁himself , ▁feels ▁miser able ▁and ▁not ▁happy , ▁does ▁not ▁develop ▁free ▁mental ▁and ▁physical ▁energy , ▁but ▁mort ifies ▁his ▁flesh ▁and ▁ru ins ▁his ▁mind '. ▁While ▁under ▁commun ism , ▁' In ▁the ▁individual ▁expression ▁of ▁my ▁life ▁I ▁would ▁have ▁directly ▁created ▁your ▁expression ▁of ▁your ▁life , ▁and ▁therefore ▁in ▁my ▁individual ▁activity ▁I ▁would ▁have ▁directly ▁confirmed ▁and ▁real ised ▁my ▁true ▁nature , ▁my ▁human ▁nature , ▁my ▁commun al ▁nature '. ▁ ▁Human ▁nature ▁and ▁historical ▁material ism ▁Marx ' s ▁theory ▁of ▁history ▁attempts ▁to ▁describe ▁the ▁way ▁in ▁which ▁humans ▁change ▁their ▁environments ▁and ▁( in ▁dialect ical ▁relation ) ▁their ▁environments ▁change ▁them ▁as ▁well . ▁That ▁is : ▁ ▁Not ▁only ▁do ▁the ▁objective ▁conditions ▁change ▁in ▁the ▁act ▁of ▁reprodu ction , ▁e . g . ▁the ▁village ▁becomes ▁a ▁town , ▁the ▁w ilder ness ▁a ▁cleared ▁field ▁etc ., ▁but ▁the ▁produ cers ▁change , ▁too , ▁in ▁that ▁they ▁bring ▁out ▁new ▁qual ities ▁in ▁themselves , ▁develop ▁themselves ▁in ▁production , ▁transform ▁themselves , ▁develop ▁new ▁powers ▁and ▁ideas , ▁new ▁modes ▁of ▁inter course , ▁new ▁needs ▁and ▁new ▁language . ▁ ▁Further ▁Marx ▁sets ▁out ▁his ▁' material ist ▁conception