Every habit makes a line in man's mind, and the continuation of that habit wakens that line from sleep; in other words it gives the line sensitiveness, which is the feeling of life; and in time man indulges in his habit. If a person takes a liking to a certain phrase of music its every repetition gives him a renewed joy; when someone enjoys a certain poetry it cannot be repeated to him too often; if anyone likes a certain dish, in time he has a craving for it. Not only praise or flattery does man enjoy, but even insults, if they have made a deep line on his mind; he will try to tease others or offend somebody, in order to receive an insult. He may not outwardly seem to enjoy it, and yet he will revel in it.