O thou who art firm in The Covenant! … According to the clear text of the Book of Akdas and the explicit contents of the Book of The Covenant, ‘Abdu’l-Baha is the Interpreter of all the Works and Books of the Blessed Perfection [Baha’u’llah] and not only of the Book of Akdas. This question is clear and evident to those who are informed of the Writings and Tablets (of Baha’u’llah). Were this not the case every one would have given an interpretation according to his own inclination, and considering his own interpretation preferable to the interpretation of others which naturally lead to great differences."
- ‘Abdu’l-Baha (Star of the West, vol. 5, no. 9, August 20, 1914)