Christian unity is not enough. There must be unity among all mankind, and they will come from all religious backgrounds, and God can weld them into a single body just as easily as He has put a single atmosphere above them, and made them walk on the same globe, and made all their blood red. It takes time to accomplish both.
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…and there shall be one fold, and one shepherd.** (John 10:16 KJV)
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God will one day bring you all together; verily, God is All-Powerful. **(Qur’án, 2:148)
**That which the Lord hath ordained as the sovereign remedy and mightiest instrument for the healing of all the world is the union of all its peoples in one universal Cause, one common Faith. This can in no wise be achieved except through the power of a skilled, an all-powerful and inspired Physician. This, verily, is the truth, and all else naught but error.(**Gleanings from the Writings of Baha’u’llah, p. 255)
How is this possible? Because Baha’u’llah’s enemies banished Him to Palestine, and He summoned the Jews to return from their exile, and still, it is as if the nations can’t see their hand in front of their face.
By Thine aloneness the Sun of Oneness shone, and by Thy banishment the land of Unity was adorned. Be patient, O Thou Exile of the worlds.(Baha’u’llah, Fire Tablet, Baha’i Prayers, p. 218)
When the victory arriveth, every man shall profess himself as believer and shall hasten to the shelter of God’s Faith. Happy are they who in the days of world-encompassing trials have stood fast in the Cause and refused to swerve from its truth.(Gleanings from the Writings of Baha’u’llah, p. 319)