The significance of the Sphinx in both Egyptian and Greek mythology revolves around its riddles. In Egypt, the Sphinx represents wisdom and protection, often guarding sacred sites. In Greek mythology, the Sphinx challenges Oedipus with a riddle: "What walks on four legs in the morning, two at noon, and three in the evening?" Failing to answer led to death, symbolizing the consequences of ignorance. The Sphinx embodies the theme of knowledge as power, emphasizing the balance between intellect and fate.