The vast majority of his writings were in the style of letters to Baháʼís from all parts of the globe. These letters, of which 17,500 have been collected thus far, are believed to number a total of 34,000 unique works. They ranged from routine correspondence regarding the affairs of Baháʼís around the world to lengthy letters to the Baháʼís of the world addressing specific themes. Some of his longer letters and collections of letters include World Order of Baháʼu'lláh, Advent of Divine Justice, and Promised Day is Come.
The vast majority of his writings were in the style of letters to Baháʼís from all parts of the globe. These letters, of which 17,500 have been collected thus far, are believed to number a total of 34,000 unique works. They ranged from routine correspondence regarding the affairs of Baháʼís around the world to lengthy letters to the Baháʼís of the world addressing specific themes. Some of his longer letters and collections of letters include World Order of Baháʼu'lláh, Advent of Divine Justice, and Promised Day is Come.