Tablets of the Divine Plan “are the Charter for the teaching of the Faith”

As you are no doubt aware, the Tablets of the Divine Plan, which were revealed by 'Abdu'l-Bahá during the First World War, are the Charter for the teaching of the Faith. All the teaching plans launched by the beloved Guardian, as well as those subsequently directed by the Universal House of Justice, are stages in the implementation of this master plan conceived by the Centre of the Covenant for the diffusion of the Message of Bahá'u'lláh. 

- The Universal House of Justice  (From a letter written on behalf of the Universal House of Justice to an individual believer, September 29, 1977; compilation: Lights of Guidance)

English translation of the first Tablet of the Divine Plan which was addressed to the friends in the northeastern states of the United States. It was on the back and front of two postcards, and bearing the original signature of ‘Abdu'l-Baha. They were sent, along with their original Persian, to the address of Hooper Harris, a prominent Baha’i in New York City. This was during World War I. 
(See additional pictures, text, and a PowerPoint at Tablets of the Divine Plan - historical context)