What is apocalyptic?: Knowledge of the divine mysteries through revelation -- Apocalyptic and eschatology -- Apocalypse and apocalyptic -- The content of the heavenly mysteries: What is above: The mysteries of God, the angels, and astronomy -- What is below: Man and his world -- What had happened previously: The interest in past history in apocalyptic -- What is to come -- Towards an understanding of the origins of apocalyptic and the dates of the apocalypses: A survey of recent study on the origins of apocalyptic -- An attempt to elucidate the origins of apocalyptic visions -- Dating the apocalypses -- The esoteric tradition in early rabbinic Judaism: The meditation of Rabban Johanan Ben Zakkai and his circle on the chariot-chapter -- The problems posed by the esoteric tradition in the time of Rabbi Akiba -- Apocalyptic in early Christianity: Reports of visions in early Christian literature to AD 200 -- Revelation -- Conclusion.