The more we think of the mind, the more we understand the nature of the human being. The tendency to sin or virtue, the temperament, the attitude towards right and wrong, failure and success, in fact all changes in life, are entirely dependent on the condition of the mind. The dream tells the state of the mind at the time; the mind is in full play when a person is asleep. It is not free during the waking hours because of the occupations of the day. The dream will show the state of a patient's mind. It is a disturbance of the mind that produces coma.