Studies by Dariush Maani on the Hidden Words of Baha'u'llah. 

The International Teaching Center has said of Mr. Maani’s work, “The extent of his knowledge and his research in mysticism and spiritual subjects – especially in The Hidden Words – deserve to be praised and honored. He has researched many writings and sources and made an unprecedented collection of valuable reference points.” His book, A Treasure House of Mysteries, is the result of his extensive studies, now translated into English and published in one volume.