All the teaching of the Prophets is one; one faith; one Divine light shining throughout the world. Now, under the banner of the oneness of humanity all people of all creeds should turn away from prejudice and become friends and believers in all the Prophets. As Christians believe in Moses, so the Jews should believe in Jesus. As the Muhammadans believe in Christ and Moses, so likewise the Jews and the Christians should believe in Muhammad. Then all disputes would disappear, all then would be united. Bahá’u’lláh came for this purpose. He has made the three religions one. He has uplifted the standard of the oneness of faith and the honour of humanity in the centre of the world. Today we must gather round it, and try with heart and soul to bring about the union of mankind.
(‘Abdu’l-Bahá, ‘Abdu’l-Bahá in London, p. 43)
Bahá’u’lláh has announced that the foundation of all the religions of God is one, that oneness is truth and truth is oneness which does not admit of plurality. This teaching is new and specialized to this Manifestation.
(‘Abdu’l-Bahá, The Promulgation of Universal Peace, p. 453)
The divine Prophets are conjoined in the perfect state of love. Each One has given the glad tidings of His successor’s coming and each successor has sanctioned the One Who preceded Him. They were in the utmost unity, but Their followers are in strife. For instance, Moses gave the message of the glad tidings of Christ, and Christ confirmed the Prophethood of Moses. Therefore, between Moses and Jesus there is no variation or conflict. They are in perfect unity, but between the Jew and the Christian there is conflict. Now, therefore, if the Christian and Jewish peoples investigate the reality underlying their Prophets’ teachings, they will become kind in their attitude toward each other and associate in the utmost love, for reality is one and not dual or multiple. If this investigation of reality becomes universal, the divergent nations will ratify all the divine Prophets and confirm all the Holy Books. No strife or rancor will then remain, and the world will become united. Then will we associate in the reality of love. We will become as fathers and sons, as brothers and sisters living together in complete unity, love and happiness; for this century is the century of light. It is not like former centuries. Former centuries were epochs of oppression. Now 223 human intellects have developed, and human intelligence has increased. Each soul is investigating reality. This is not a time when we shall wage war and be hostile toward each other. We are living at a time when we should enjoy real friendship.
(‘Abdu’l-Bahá, The Promulgation of Universal Peace, p. 222)