By former Baha'i: Darrick T. Evenson

There are mountains of letters, books, manuscripts, in Farsi, some in Arabic, from the Central Figures, and from the Companions of the Central Figure, that have never been published. Mountains. The Universal House of Justice tries to gather them up, for "safety" and "research". But not to published. You will find in them a few tidbits such as: 

DavidBinOven:

Actually No. Humans are often inconsistent and their understandings are different but the reality has always been the same. I studied comparative religions as a young, devout Christian and concluded that the major religions had to have come from the same Source and the differences were temporal or artificial before I ever heard of the Baha'i Faith. 

Of these times at Adrianople I have heard an interesting narrative from a Persian Mirza, in whose testimony as a witness I have strongest confidence. He was at the time a peesh-Khidmat to the Persian Minister at Constantinople.

By: Dale Husband

The Book of the Covenant is the will and testament of Baha’u’llah, which he had made public after his death. Baha’u’llah himself had commanded his followers to make their own wills in the Kitáb-i-Aqdas: