Mashriqu’l-Adhkar” is the spiritual foundation”

…its [Mashriqu’l-Adhkar] building is the most important of all things. This is the spiritual foundation, for that reason it is the most important of all foundations; from that spiritual foundation will come forth all manner of advancement and progress in the world of humanity. Therefore, how great is its importance.

- 'Abdu'l-Baha  (Words of ‘Abdu’l-Baha to Mason Remey during ‘Abdu’l-Baha’s first European trip; Star of the West, vol. 6, no. 7, July 13, 1915)

An indication of the greatness of this Dispensation

In this Dispensation, he [the Guardian] also told us, "Holy Book" is changed to "Most Holy Book," and "Holy Spirit" to "Most Holy Spirit." Therefore the "Greatest Name," the "Most Great Peace," and the "Most Great Dispensation." 

- Ali-Akbar Furutan  (Notes of his pilgrimage in 1941; ‘Hand of the Cause of God Furutan’, by Iran Furutan Muhajir)

Sisters of Baha’u’llah

One evening I asked the Guardian about the reference in the Gleanings to the sister of Bahá'u'lláh. He replied that some of the half-sisters of Bahá'u'lláh were loyal to Him and some disloyal. She was a loyal sister. 

- Alice Dudley  (Notes of her pilgrimage during April 1957)