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

Both during the European War and after its close 'Abdu'l-Baha, amidst countless other activities, was able to pour forth a series of great and inspiring letters which, when communications were reopened, roused believers throughout the world to new enthusiasm and zeal for service. Under the inspiration of these letters the Cause progressed by leaps and bounds and everywhere the Faith showed signs of new vitality and vigor. (45:1)

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