rate ▁upon ▁literature , ▁Ad ama ▁van ▁Sch el tem a ▁started ▁writing ▁poetry ▁and ▁abandoned ▁the ▁natural ist ▁pro se ▁which ▁had ▁until ▁then ▁been ▁his ▁main ▁affection . ▁In ▁ 1 9 0 0 , ▁he ▁published ▁his ▁first ▁collection ▁of ▁po ems , ▁" E en ▁weg ▁van ▁ver zen " ▁( A ▁way ▁of ▁vers es ). ▁ ▁For ▁Ad ama ▁van ▁Sch el tem a , ▁social ism ▁and ▁nature ▁were ▁prominent ▁sources ▁of ▁insp iration . ▁He ▁developed ▁his ▁thoughts ▁into ▁his ▁ 1 9 0 7 ▁book , ▁ ▁" De ▁gr ond sl agen ▁e ener ▁nieuwe ▁po ë zie " ▁( The ▁Fund aments ▁of ▁a ▁New ▁Po etry ). ▁This ▁book ▁marked ▁a ▁decis ive ▁break ▁with ▁the ▁T acht ig ers ▁( The ▁ 8 0 ' s ▁Mov ement ), ▁whose ▁ment ality ▁of ▁l ' art ▁pour ▁l ' art ▁had ▁been ▁very ▁influ ential ▁in ▁the ▁Netherlands . ▁Ad ama ▁van ▁Sch el tem a ▁instead ▁assert ed ▁that ▁art ▁should ▁have ▁a ▁social ▁function ▁and ▁be ▁available ▁to ▁the ▁masses . ▁ ▁When ▁working ▁on ▁this ▁book , ▁Ad ama ▁van ▁Sch el tem a ▁h ired ▁Anna ▁C ath arina ▁Kle ef stra ▁as ▁a ▁secretary . ▁They ▁soon ▁fell ▁in ▁love ▁and ▁were ▁married ▁on ▁ 2 4 ▁October ▁ 1 9 0 7 . ▁The ▁marriage , ▁while ▁child less , ▁was ▁happy , ▁and ▁the ▁couple ▁moved ▁between ▁different ▁European ▁cities ▁before ▁sett ling