The next step, concentration, implies steadiness of mind. We cannot concentrate until we have made the external part steady. Just think: can we keep our eye fixed on one spot for some time without moving it? Can we sit in one posture without fidgeting? Why, many people cannot sit still even for a photographer! This shows us that the vehicle given us to control and utilize is not completely in our power, and if the lowest vehicle we have is not in our power, though this is the simplest thing to control, how then can our mind be in our control? How can we acquire more pure and more powerful thoughts?