In the 19th century, many Christians throughout the western world expected the fulfilment of Jesus's promise to return. The widespread expectation culminated in "The Great Disappointment" of 1844. This is a verse-by-verse exploration of Jesus's greatest prophetic sermon, the Olivet Discourse, an examination of 19th century and current Christian interpretations and presents an analysis in the light of Baha'u'llah's teachings.