So to summarize. What the mind does. if you look at slide there. So when the mind goes into the past or the future, you get fatigued. It destroys your productivity like I just told you, your concentration, and it destroys your peace. so This capacity of the mind is what is destroying you friends. Its not your work. It is not the external world, it is your own mind. so what is concentration, concentration is when the intellect can keep mind on the present action, not letting it slip into the past or the future. Then you are concentrating, so to concentrate you need an intellect. That is what we are talking about today, development of the intellect.