Now consider, in this great century which is the cycle of Bahá’u’lláh, what progress science and knowledge have made, how many secrets of existence have been discovered, how many great inventions have been brought to light and are day by day multiplying in number. Before long, material science and learning, as well as the knowledge of God, will make such progress and will show forth such wonders that the beholders will be amazed. Then the mystery of this verse in Isaiah, “For the earth shall be full of the knowledge of the Lord,” will be completely evident.
One of the great events which is to occur in the Day of the manifestation of that Incomparable Branch (Bahá’u’lláh) is the hoisting of the Standard of God among all nations. By this is meant that all nations and kindreds will be gathered together under the shadow of this Divine Banner, which is no other than the Lordly Branch itself, and will become a single nation. Religious and sectarian antagonism, the hostility of races and peoples, and differences among nations, will be eliminated. All men will adhere to one religion, will have one common faith, will be blended into one race, and become a single people. All will dwell in one common fatherland, which is the planet itself. Universal peace and concord will be realized between all the nations, and that Incomparable Branch will gather together all Israel, signifying that in this cycle Israel will be gathered in the Holy Land, and that the Jewish people who are scattered to the East and West, South and North, will be assembled together.
`Abdu'l-Bahá Some Answered Questions.