Abstract: Does truth come in bite-sized chunks? If truth is chunky, ask the sophists in Plato’s Euthydemus, can the person who speaks it persist through time? And if truth is chunky, can anyone else contradict her?  Socrates seeks to provide a response: here not least in the narrative of his encounter with Crito the following day. The Euthydemus tells a tale about persistence, about the aspiration to truth and about attentiveness to others which is demanding and complex but which responds to the dangers of chunky truths.  In the frame narrative of the Euthydemus Socrates represents how metaphysical commitment and ethical content make a difference to how we talk. What he shows us matters still.