The holy Manifestations of God were sent down to make visible the oneness of humanity. For this did They endure unnumbered ills and tribulations, that a community from amongst mankind's divergent peoples could gather within the shadow of the Word of God and live as one, and could, with delight and grace, demonstrate on earth the unity of humankind. -`Abdu'l-Bahá Selections From the Writings of `Abdu'l-Bahá P. 278