If you sit quietly and concentrate on just noticing that thoughts arise in your mind, at first it will seem that they just pop up suddenly, out of “thin air”. Not only that, but one thought immediately spawns a bunch of other thoughts, until you sort of snap out of it and realize that you’ve been thinking all sorts of things. With practice, however, you can learn to not get carried away from one thought to another, but just let them go. With more practice, you can experience a state in which thoughts don’t arise at all. From that point of view, its easy to see that the thoughts we experience are a result of a misunderstanding about what is important, and more to the point, what is real.
So we experience thought as though it was urgent, important, and something we can’t ignore, but after practicing, we can see that thoughts are a distraction from true concentration. You have to experience this to understand. Its like explaining the color green to a blind person. We experience thoughts every single moment of every day, but we rarely if ever understand what it means to have a thought in comparison to what it is to comprehend without thinking. Its weird, and until you practice a bit, it sounds like gibberish. But you have to admit that it was a question without a clear target.