We have fixed a time for you, O people! 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!
(Baha’u’llah, quoted by Shoghi Effendi in ‘The Promised Day Is Come’)