The Book of Enoch, written during the second century B.C., is one of the most important non-canonical apocryphal works, and probably had a huge influence on early Christian, particularly Gnostic, beliefs. Filled with hallucinatory visions of heaven and hell, angels and devils, Enoch introduced concepts such as fallen angels, the appearance of a Messiah, Resurrection, a Final Judgement, and a Heavenly Kingdom on Earth. Interspersed with this material are quasi-scientific digressions on calendrical systems, geography, cosmology, astronomy, and meteorology. (Quote from sacred-texts.com)
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