This video explores the philosophical concept of personal identity, particularly through the lens of philosopher Michael Huemer. It presents the paradox of Theseus's ship to illustrate the problem of maintaining identity despite continuous physical change. The video examines and refutes several materialist theories of personal identity (based on the body, brain, memory, and spatiotemporal continuity), ultimately arguing that the existence of an immaterial soul is the most coherent explanation for personal identity over time.