Green Grass and a Barbed Wire

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Several years ago there was a cartoon of two fields divided by a barbed-wire fence. Both were about the same size and each had plenty of lush green grass. each field had a mule whose head was stuck through the fence, eating from the other's green pasture. Although each mule was surrounded by a plenty of grass, the neighboring field seemed more desirable-even though it required pushing up against barbs to reach it. the Cartoonist summed up the whole scene with one word: "DISCONTENT" What do you think why men are discontented all though he has already something?