The phrase "Pandora's box" symbolizes unexpected consequences stemming from curiosity and the release of evil into the world. In Greek mythology, Pandora was the first woman, created by the gods, who received a box containing all of humanity's ills. Her curiosity led her to open it, releasing suffering and misfortune upon the world, leaving only hope inside. This myth serves as a cautionary tale about the dangers of temptation and the unforeseen consequences of our actions.