The “Administration of Bahá'u'lláh's invincible Faith” is the “infallible Organ for the accomplishment of a Divine Purpose”

Out of the pangs of anguish which His bereaved followers have suffered, amid the heat and dust which the attacks launched by a sleepless enemy had precipitated, the Administration of Bahá'u'lláh's invincible Faith was born. The potent energies released through the ascension of the Center of His Covenant crystallized into this supreme, this infallible Organ for the accomplishment of a Divine Purpose. The Will and Testament of 'Abdu'l-Bahá unveiled its character, reaffirmed its basis, supplemented its principles, asserted its indispensability, and enumerated its chief institutions.... (Shoghi Effendi, ‘America and the Most Great Peace, 21 April 1933, "The World Order of Bahá'u'lláh: Selected Letters’; The Compilation of Compilations, vol. II, The Significance of the Formative Age of Our Faith)