1 story on this theme.
In His own words, in the Epistle to the Son of the Wolf, Bahá'u'lláh recalls the four months He spent chained in the lightless underground dungeon of Ṭihrán — and how, in that very darkness, the first intimations of His Revelation broke upon Him like a dawn, a Voice calling from above His head and a sense that the whole creation had been set astir.