The Revelation of Bahá'u'lláh, whose supreme mission is none other but the achievement of this organic and spiritual unity of the whole body of nations, should, if we be faithful to its implications, be regarded as signalizing through its advent the coming of age of the entire human race. It should be viewed not merely as yet another spiritual revival in the ever-changing fortunes of mankind, not only as a further stage in a chain of progressive Revelations, nor even as the culmination of one of a series of recurrent prophetic cycles, but rather as marking the last and highest stage in the stupendous evolution of man's collective life on this planet. The emergence of a world community, the consciousness of world citizenship, the founding of a world civilization and culture – all of which must synchronize with the initial stages in the unfoldment of the Golden Age of the Bahá'í Era – should, by their very nature, be regarded, as far as this planetary life is concerned, as the furthermost limits in the organization of human society, though man, as an individual, will, nay must indeed as a result of such a consummation, continue indefinitely to progress and develop.
That mystic, all-pervasive, yet undefinable change, which we associate with the stage of maturity inevitable in the life of the individual and the development of the fruit, must, if we would correctly apprehend the utterances of Bahá'u'lláh, have its counterpart in the evolution of the organization of human society. A similar stage must sooner or later be attained in the collective life of mankind, producing an even more striking phenomenon in world relations, and endowing the whole human race with such potentialities of well-being as shall provide, throughout the succeeding ages, the chief incentive required tor the eventual fulfilment of its high destiny. Such a stage of maturity in the process of human government must, for all time, if we would faithfully recognize the tremendous claim advanced by Bahá'u'lláh, remain identified with the Revelation of which He was the Bearer. (Shoghi Effendi, 11 March 1936, in The World Order of Bahá'u'lláh: Selected Letters’; The Compilation of Compilations, vol. III, Cultural Diversity in the Age of Maturity)
