Whichever element predominates in a person's nature, the sense relative to that element in him is the most active. And as breath changes so many times throughout the day and night, its element acts in accordance with the senses. This is the cause of every demand of the senses. He who indulges in any one of the senses makes that sense dull, just as attar, kept all the time near oneself, dulls in time the sense of smell, although it enslaves one to the smell of attar. The same is the case with all senses. The Sufi, therefore, experiences life through the senses for the sake of experience and not for indulgence, the former being master and the latter slavery.