The document explores various philosophical perspectives on self-identity, including contributions from Socrates, Plato, Augustine, Aquinas, Descartes, Hume, Kant, Ryle, and Merleau-Ponty. Each philosopher presents distinct ideas about the self, ranging from the duality of body and soul to the self as a collection of impressions and behaviors. The text emphasizes the importance of understanding the self through a historical and comparative lens of these philosophical viewpoints.