Some Ans. Questions 1908 by -'Abdu'l-Bahá- 1 Para

"And the temple of God was opened in heaven"3 means that the divine Jerusalem is found, and the Holy of Holies has become visible. The Holy of Holies, according to the terminology of the people of wisdom, is the essence of the Divine Law, and the heavenly and true teachings of the Lord, which have not been changed in the cycle of any Prophet, as it was before explained. The sanctuary of Jerusalem is likened to the reality of the Law of God, which is the Holy of Holies; and all the laws, conventions, rites and material regulations are the city of Jerusalem-- this is why it is called the heavenly Jerusalem. Briefly, as in this cycle the Sun of Reality will make the light of God shine with the utmost splendor, therefore, the essence of the teachings of God will be realized in the world of existence, and the darkness of ignorance and want of knowledge will be dispelled. The world will become a new world, and enlightenment will prevail. So the Holy of Holies will appear (59:4)

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