 He argues that the man who knows the subjects about which he tells lies, whether arithmetic, geometry, or astronomy, is twice as powerful as the man who does not know his subjects.Socrates never indicates what a man might stand to gain from lying about such matters, but brings the conversation back around to Achilles, and what kind of man Homer intended to portray.Socrates argues that Achilles is such a good liar in the "Iliad" that he fools even Odysseus, who never notices his duplicity (371a).