“The Book of My Covenant,”

To direct and canalize these forces let loose by this Heaven-sent process, and to insure their harmonious and continuous operation after His ascension, an instrument divinely ordained, invested with indisputable authority, organically linked with the Author of the Revelation Himself, was clearly indispensable. That instrument Bahá’u’lláh had expressly provided through the institution of the Covenant, an institution which He had firmly established prior to His ascension. This same Covenant He had anticipated in His Kitáb-i-Aqdas, had alluded to it as He bade His last farewell to the members of His family, who had been summoned to His bed-side, in the days immediately preceding His ascension, and had incorporated it in a special document which He designated as “the Book of My Covenant,” and which He entrusted, during His last illness, to His eldest son ‘Abdu’l-Bahá.

 Shoghi Effendi