You can think about your problems or you can worry about them, and there is a vast difference between the two. Worry is thinking that has turned toxic. It is jarring music that goes round and round and never comes to either climax or conclusion. Thinking works its way through problems to conclusions and decisions; worry leaves you in a state of tensely suspended animation. When you worry, you go over the same ground endlessly and come out the same place you started. Thinking makes progress from one place to another; worry remains static. The problem of life is to change worry into thinking and anxiety into creative action.
Harold B. Walker