Unforeseen calamity followeth you,

Gate to Shrine of Bahá’u’lláh

The whole of mankind is groaning, is dying to be led to unity, and to terminate its age-long martyrdom. And yet it stubbornly refuses to embrace the light and acknowledge the sovereign authority of the one Power that can extricate it from its entanglements, and avert the woeful calamity that threatens to engulf it. Ominous indeed is the voice of Bahá’u’lláh that rings through these prophetic words: “O ye peoples of the world! Know, verily, that an unforeseen calamity followeth you, and grievous retribution awaiteth you. Think not that which ye have committed hath been effaced in My sight.”
And again: “We have a fixed time for you, O peoples. If ye fail, at the appointed hour, to turn towards God, He, verily, will lay violent hold on you, and will cause grievous afflictions to assail you from every direction. How severe, indeed, is the chastisement with which your Lord will then chastise you!”

 Shoghi Effendi, The World Order of Bahá’u’lláh