You can just be instead of think. Unless you specifically want to think of something that’s useful, it’s just a habitual process which goes on inside our heads. Positive thought is one thing – irrational thought is another. A lot of the time we think things we don’t want to think, so who’s in control? When this happens, ignore the thought and go down into the feeling area. Gradually this brings some control, the ability to think when you want to, and to not think when you don’t need to.