Patience is required in meditation; a person gets tired because he is accustomed to activity throughout the day. His nerves are all inclined to go on and on in that activity which is not really for his benefit, and yet it is giving him the inclination to go on; and when he sits with his eyes closed he feels uncomfortable, for the mind which has been active all day becomes restive, just like a horse after having had a long run. Then if you want that horse to stand still, it is restive. It cannot stand still, because every nerve has been active, and it becomes almost impossible to keep that horse still. And so it is with man.