In Hesiod’s Pandora story, the concept associated with what remains in the jar is hope.
The Greek term is Elpis, a personification of hope. Hesiod says that the container releases many kinds of evils, while Elpis remains inside. Readers and scholars have debated whether this means hope is preserved for humans or whether hope is itself withheld from them. The poem’s exact wording and the role of the sealed container make the passage unusually open to interpretation.
Modern retellings usually present the story more optimistically: hope stays behind as a consolation after suffering spreads through the world. That reassuring interpretation is widespread, but it is not the only way the ancient passage has been understood.
The common expression “Pandora’s box” also simplifies Hesiod’s account. The original object is described as a large storage vessel, and later translation choices helped turn the vessel into the familiar box.