Now coming to the third stage of consciousness -- this stage lies between spirit and matter. It is this state of consciousness which we experience as the condition of sleep which we call fast sleep, deep sleep, when we do not even dream. There is so little said about it and very few think about it. Once a person studies this question of sleep he will find that it is the greatest marvel in the world. It is a living phenomenon. The rest and peace, vitality and vigor, intelligence and life that come to a man during that time of sleep is beyond explanation. Yet man is so ungrateful, he is never thankful for this experience given to him every day. He is only unhappy when he has lost it; then nothing in the world can satisfy him. No wealth, no comfort, no home, no position, nothing in the world can replace that experience which is as simple as sleeping, which means nothing and yet is everything.