This brings us to the subject of concentration. A person who is sitting with closed eyes is not necessarily concentrating; he may just be resting or he may be asleep. If he is dreaming, that is not concentration either. Concentration is an act of the will during which the mind actually sees, during which the seeing faculty of the mind acts as well as the hearing faculty. To concentrate well one should think of a hot pan in which the oil is always fluid, so that things cook quickly in it. Do not let that pan cool through extraneous occupations. If one's mind is strongly concentrated on one thing, whatever else comes in the way will be done as well.