Baha’u’llah asks God to ordain for ‘Abdu’l-Baha “that which Thou hast destined for Thy Messengers and the Trustees of Thy Revelation”

Thou knowest, O my God, that I desire for Him [‘Abdu’l-Baha] naught except that which Thou didst desire, and have chosen Him for no purpose save that which Thou hadst intended for Him. Render Him victorious, therefore, through Thy hosts of earth and heaven... Ordain, I beseech Thee, by the ardor of My love for Thee and My yearning to manifest Thy Cause, for Him, as well as for them that love Him, that which Thou hast destined for Thy Messengers and the Trustees of Thy Revelation. Verily, Thou art the Almighty, the All-Powerful.  

- Baha'u'llah  (Quoted by Shoghi Effendi in 'The World Order of Baha'u'llah')