Socrates points out that those who exercise the body are caring only for the part that is ruled, while neglecting the soul, which is what rules (407e5-e8). He goes on to say that if someone does not know how to use a tool, such as a lyre, eyes, ears and body, then that person would not know how to use that of his neighbors (407e8-408a4). Rather than using it incorrectly, it should be left alone (407e8-e9). The same concept pertains to the soul. If one does not know how to use their soul, then they should die or submit themselves to a life of slavery and those who are experts should rule (408a5-b3).