…the Bearers of the trust of God are made manifest unto the peoples of the earth as the Exponents of a new Cause and the Bearers of a new Message. Inasmuch as these Birds of the Celestial Throne are all sent down from the heaven of the Will of God, and as they all arise to proclaim His irresistible Faith, they therefore are regarded as one soul and the same person. For they all drink from the one Cup of the love of God, and all partake of the fruit of the same Tree of Oneness. – The Book of Certitude, p. 152.
The foundation underlying all the divine precepts is one reality…. and reality is one. Therefore the foundation of the divine religions is one. But we can see that certain forms and ceremonies have crept in. They are heretical, they are accidental, because they differ, hence they cause differences among religions. If we set aside all superstitions and see the reality of the foundation we shall all agree, because religion is one and not multiple. – Abdu’l-Baha, Divine Philosophy, p. 25.
It is clear and evident to thee that all the Prophets are the Temples of the Cause of God, Who have appeared clothed in diverse 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! – Baha’u’llah, Gleanings from the Writings of Baha’u’llah, p. 50.
Therefore did Baha’u’llah cry, “O God, deliver us from the sea of names!” Man must turn to the light and not think that the form of the lamp is essential, for the lamp may be changed; but he who longs for light welcomes it from whatever source it comes. – Abdu’l-Baha, Divine Philosophy, p. 32.