The present aims to investigate two subjects in Plato's Phaedrus: first, the relations between Eros and mania from the encounter of Sócrates with beautiful Phaedrus in the stroll by the llysus; and secondly, the speech of the poet Stesichorus (the second of Sócrates) in which Plato approximate mythos and logos establishing the surprising connection between mania and philosophy, using the concept of memory,. After taking in to account the specific circumstances of the beginning of the dialogue, this work will focus it self on four aspects of the reflection on Eros in the Phaedrus : 1) Eros makes the sensible-intelligible connection providing the argumentativ logos; 2) Delirium (mania) is a form of non-reasonable knowledge and is fundamental for philosophy; 3) logos, understood as word, articulated in sentences presents limits to knowledge; 4) Beauty, Eros and Logos create links between fields that we call aesthetics, ethics, politics and epistemology.