The Will of the divine Testator is this: It is incumbent upon the Aghsan, the Afnan and My Kindred to turn, one and all, their faces towards the Most Mighty Branch. Consider that which We have revealed in Our Most Holy Book: 'When the ocean of My presence hath ebbed and the Book of My Revelation is ended, turn your faces toward Him Whom God hath purposed, Who hath branched from this Ancient Root.' The object of this sacred verse is none other except the Most Mighty Branch [Abdu'l-Bahá]. Thus have We graciously revealed unto you Our potent Will, and I am verily the Gracious, the All-Powerful. Verily God hath ordained the station of the Greater Branch [Muhammad Ali] to be beneath that of the Most Great Branch [Abdu'l-Bahá]. He is in truth the Ordainer, the All-Wise. We have chosen 'the Greater' after 'the Most Great', as decreed by Him Who is the All-Knowing, the All-Informed.
(Baha'u'llah, Tablets of Baha'u'llah revealed after the Kitab-i-Aqdas)