the idea of why human beings long for what they do n't have , and how this gets us in trouble 
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(ROOT (NP (NP (DT ) (NN )) (PP (IN ) (SBAR (SBAR (WHADVP (WRB )) (S (NP (JJ ) (NNS )) (VP (RB ) (PP (IN ) (SBAR (WHNP (WP )) (S (NP (PRP )) (VP (VBP ) (RB ) (VP (VB ))))))))) (, ) (CC ) (SBAR (WHADVP (WRB )) (S (NP (DT )) (VP (VBZ ) (NP (PRP )) (PP (IN ) (NP (NN ))))))))))