 The kind of knowledge that would be most beneficial would be knowledge of good and evil (174b, ff.), but this is not the same thing as sophrosune. So this line of inquiry has led to the contrary results that the virtue in question is and is not beneficial. The speakers confess aporia (an impasse) and pledge to continue. Critias and Charmides threaten to use force to wrest continuing education from Socrates. This is a joke, but it comes with a disturbing historical irony, because Charmides will follow Critias into a leadership position in the regime of the Thirty Tyrants. Their use of force will terrorize the people, but not achieve what Critias wants in the long run.