Excellent! I am really grateful to you and
@Tony Bristow-Stagg for taking the time to search this out. I am unable to read Persian at all so I am completely dependent on your skills here. But from what I can read of Gulpaygani, and brief descriptions of these texts, he was interpreting the prophecies of Islam, Christianity and Judaism rather than the Bab's and Baha'u'llah's writings?
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That is right.
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It seems also not be a very long book - I wonder why - especially since it is obviously in the public domain - it has not been translated in English yet?
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Some of the works of Mirza Abulfazl has been translated.
But it is upto people to translate them. If I had the time I would.
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One would have thought given the Baha'i goal of unifying religion, tying these prophecies together so clearly would have been a key goal?
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I am not sure. Baha'i Faith has the goal of uniting mankind by teaching ethics in my understanding.
To tell you the truth, in my opinion, perhaps majority of the Baha'is are not aware or even concerned about prophecies of old Books. What you see on the internet is not a very typical way of teaching Baha'i Faith. The Baha'is focus on teaching ethics. They have certain universal classes or gatherings to read books on topics such as serving humanity, education, history of the faith, etc.
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Anyway, all that said, it doesn't change my argument too much - what we now have is an unquestionably learned scholar interpreting the prophecies of the Abrahamic faiths and apparently matching them to the appearance of the Bab (I presume that is explicit in his interpretations?) - something that neither the Bab, Baha'u'llah or Abdu'l Baha had managed to do before him.
Here we need a little more understanding of the history of the Baha'i Faith.
It all began in Persia, a country which at the time and even now is a Shia majority.
In Shia Islam as well as Sunni Islam, there are prophecies about Promised one of Islam, called the Qaim or Mahdi. The number of these Prophecies as recorded in Islamic Traditions, without exaggerating are several thousands. Giving a great amount of details of the events that would comes to pass at the time of Manifestations. If we are talking about prophecies, to these people Mahdi of Islam was important. When the Bab appeared, He wrote many verses, a main portion of them in the style of Quran, while in a fairly fast speed. Many of these verses were allusions and explanation of Prophecies of Mahdi. His argument was also this: I was trained as Merchant, and did not have education in Arabic or religion, and that God had told you in the Quran no body can bring verses like Quran. Now since I can, these must be Revelations from God. Of course this is a very brief summary. But the point is to know Islam itself has a great number of Prophecies and the main audience of the Bab were Muslims. The Bab however had appeared to have a main purpose of His Revelation: He constantly was making His followers ready for another Person to appear after Himself Who is a Greater Being, and He referred to Him as Whom God shall make manifest. Briefly, by the time Bahaullah declared He was that Promised One to the Followers of the Bab, already 19 years had pass from declaration of the Bab, and about 13 years from execution of the Bab, and at the time Bahaullah declared, they were all exiled out of Persia. Now again the point is, the Audience of Bahaullah at that time were the Bab'is who expected the Promised One of the Bab.
This was year 1863.
Now, during 1856 to 1863, the Mission of Bahaullah was firstly to teach new ethics to the Bab's who grew out of Islam with ideas of Holy War, while Bahaullah was creating a new community that is peaceful, and ethical. Also in those days, Bahaullah was writing some Books still proving that the Bab was the fulfilment of Islam. This was required because many of them were questioning how can the Bab be the Qaim and yet they killed Him.
Once this period passed, Bahaullah declared He is the Promised One of the Bab. Now, at this Time, Bahaullah also was dealing through new Writings how He is fulfilment of the Bab based on the Scriptures of the Bab.
My point of giving this brief history is to show, the revelation of the Bab and Bahaullah had to go step by step, and Their writings as far as related to Prophecies were prioritized based on Their Audiences and their Questions. Thus the need to go through details of the Biblical Prophecies were not really urgent because Their immediate Audiences required or requested things related to Islam and then the Bab'i Faith.