‘Abdu’l-Baha is the Interpreter of Baha’u’llah’s Word

Colorized portrait of ‘Abdu’l-Bahá taken in Paris,
France,October 1911
(Baha'i Media Bank)

'Abdu'l-Bahá, writing in confirmation of the authority conferred upon Him by Bahá'u'lláh, makes the following statement: "In accordance with the explicit text of the Kitáb-i-Aqdas Bahá'u'lláh hath made the Center of the Covenant the Interpreter of His Word -- a Covenant so firm and mighty that from the beginning of time until the present day no religious Dispensation hath produced its like." 

- Shoghi Effendi  (‘The World Order of Baha'u'llah’)