Light of the Pacific #54 May/June 1970 p2
"We do not know the exact dates when the Báyan was revealed. Undoubtedly it will be translated in the future, but the style is extremely difficult and great learning will be required for such a work. As the Bayan was superseded by Baha'u'llah's laws it is not essential for us to have it at this time."
(To an individual believer, dated August 5, 1949.)
1949-08-05 translation of Bayan is difficult