This contribution considers the evidence of λογος and μυος in Plato's metaphysical exposés Grg. 523a1-527e7, Phd. 107c1-115a7, R. 614a5-621d3 and Phdr. 246a3-257b6. The two terms differ widely. λογος proves to be the central idea of Platonic philosophy, meaning in particular philosophical arguing, investigation, debate, concept. Understood as a discourse on mythical level μυος is without doubt a remarkable phenomenon in Plato's dialogues, especially when it exhibits divinatory dimensions. But it can be a simple story-telling, too. Abandoning the reality μυος fails to come up to the whole truth. It goes without saying that both λογος and μυος have further significant semantic facets. Although they seem sometimes to approach each other, λογος and μυος are basically different, as the texts display in detail.