Desire means you are dragged out of the moment; that creates a tension, that creates anxiety, that creates hope. And then finally hope turns sour, becomes frustration. Each hope leads you into anguish. Buddha calls it the only impurity. Cut the roots of desire, live in the moment so totally, pull yourself out of the past and don`t project yourself into the future. Let this moment be all and all. And your life will have such a purity, such a crystal-clear consciousness that right now you cannot imagine.