"It is clear and evident to thee that all the Prophets are the Temples of the Cause of God, Who have appeared clothed in divers attire. If thou wilt observe with discriminating eyes, thou wilt behold Them all abiding in the same tabernacle, soaring in the same heaven, seated upon the same throne, uttering the same speech, and proclaiming the same Faith. Such is the unity of those Essences of Being, those Luminaries of infinite and immeasurable splendor! Wherefore, should one of these Manifestations of Holiness proclaim saying: “I am the return of all the Prophets,” He, verily, speaketh the truth. In like manner, in every subsequent Revelation, the return of the former Revelation is a fact, the truth of which is firmly established….
The other station is the station of distinction, and pertaineth to the world of creation, and to the limitations thereof. In this respect, each Manifestation of God hath a distinct individuality, a definitely prescribed mission, a predestined revelation, and specially designated limitations. Each one of them is known by a different name, is characterized by a special attribute, fulfils a definite mission, and is entrusted with a particular Revelation. Even as He saith: “Some of the Apostles We have caused to excel the others. To some God hath spoken, some He hath raised and exalted. And to Jesus, Son of Mary, We gave manifest signs, and We strengthened Him with the Holy Spirit.”
-Bahá'u'lláh,
Gleanings From the Writings of Bahá’u’lláh, XXII p. 52