The Báb, the inaugurator of the Bábí Dispensation,..

That the Báb, the inaugurator of the Bábí Dispensation, is fully entitled to rank as one of the self-sufficient Manifestations of God, that He has been invested with sovereign power and authority, and exercises all the rights and prerogatives of independent Prophethood, is yet another fundamental verity which the Message of Bahá'u'lláh insistently proclaims and which its followers must uncompromisingly uphold. That He is not to be regarded merely as an inspired Precursor of the Bahá'í Revelation, that in His person, as He Himself bears witness in the Persian Bayan, the object of all the Prophets gone before Him has been fulfilled, is a truth which I feel it my duty to demonstrate and emphasize. We would assuredly be failing in our duty to the Faith we profess and would be violating one of its basic and sacred principles if in our words or by our conduct we hesitate to recognize the implications of this root principle of Bahá'í belief, or refuse to uphold unreservedly its integrity and demonstrate its truth.

Shoghi Effendi, The Dispensation of Baha'u'llah