Baha'u'llah & the New Era 1970 by -J. Esslemont- 1 Para

Moreover, unlike previous Dispensations, the Faith of Baha'u'llah had within it the potency of a universal human society. During 'Abdu'l-Baha's mission covering the period 1892 to 1921, the Faith evolved through successive stages of development in the direction of a true world order, Its development required continuous direction and specific instruction from 'Abdu'l-Baha, Who alone knew the fullness of that new potent inspiration brought to earth in this age. Until His own Will and Testament was revealed after 'Abdu'l-Baha's departure from the flesh, and its significance was expounded by Shoghi Effendi, the Guardian of the Faith, the Baha'is almost inevitably attributed their beloved Master's guidance a degree of spiritual authority equaling that of the Manifestation. (48:3)

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