Worrying is the other name of hope. When you think negatively about the future, you call it worry. When you think positively about the future, you call it hope. So, worrying is just as equally bad as hoping.
Conserve your energy. Train your thoughts. Discipline your little self. Time is precious. Attention is precious.
To waste time, it is not necessary that you must do something wasteful; it is just enough to worry. You can sit on your armchair doing absolutely nothing and still you can waste an enormous length of time, can’t you? What are you doing? No, you are doing something more than doing: you are worrying. It is no ordinary action; it is hell of an action! It is called worrying.