We have tied our thoughts and feelings to the things, so that we can´t feel happy without them: they feed our vanity, they give us social prestige, they give us means for display of force.
We use them for other purposes, than they in themselves are implying.
That we need food, clothes, shelter, is natural and not wrong, but when we are dependent of them in order to be able to satisfy our love of lust, when the things not only become a psychological necessity, but directly an existential necessity, then they are taking an all too colossal place in our life.
That way arises the fights and the conflicts for achieving and keeping the things, which we are dependent of. And this fight is unnatural.