The gnomic philosopher and father of the “Logos” tradition, Heraclitus of Ephesus, says in what scholarship usually arranges to be the first of his surviving fragments that the man of wisdom has a dual duty to discern the essence of every significant thing and to name it properly. A necessary element of any intellectual doctrine incorporating an idea of truth as something linked to an actually existing external world, this venerable fifth-century BC philosophical notion also supplies scientific investigation with one of its primary goals. In Plato’s dialogues, Socrates, who speaks admiringly of Heraclitus and often quotes him, shows a penchant, when in conversation with his sophistic partners, to wheedle them about proper definitions of terms. Skeptical readers of Plato’s text and the non-metaphysically inclined find in this trait no little annoyance. But even skeptics and the non-metaphysical need, on occasion, to define who they are. In one of the ironic features of the Platonic text, Socrates not infrequently fails to arrive at the proper or convincing definition of a term. The most notorious such failure comes with the case of “the Good,” a topic in most of the dialogues. But the principle is here the important thing, not its fulfillment in every instance. It might well be that defining terms can pose difficulties, especially in the case of the most important, most unavoidable concepts, such as “the Good.”