June 11. On this date in 1934, Shoghi Effendi wrote a letter to the National Spiritual Assembly of the United States and Canada noting "that the authority of the National Spiritual Assembly is undivided and unchallengeable" and that "the obedience of individual Bahá'ís, delegates, groups, and assemblies to that authority is imperative, and should be whole-hearted and unqualified."

June 11. On this date in 1934, a letter written on behalf of Shoghi Effendi stated "the Guardian wishes me to again affirm his view that the authority of the National Spiritual Assembly is undivided and unchallengeable in all matters pertaining to the administration of the Faith ... and that, therefore, the obedience of individual Bahá'ís, delegates, groups, and assemblies to that authority is imperative, and should be whole-hearted and unqualified."

127. Obedience to the National Spiritual Assembly is the Basis for Unity
"...the Guardian wishes me to again affirm his view that the authority of the National Spiritual Assembly is undivided and unchallengeable in all matters pertaining to the administration of the Faith ... and that, therefore, the obedience of individual Bahá'ís, delegates, groups, and assemblies to that authority is imperative, and should be whole-hearted and unqualified. He is convinced that the unreserved acceptance and complete application of this vital provision of the Administration is essential to the maintenance of the highest degree of unity among the believers, and is indispensable to the effective working of the administrative machinery of the Faith in every country."
(From a letter written on behalf of Shoghi Effendi to the National Spiritual Assembly of the United States and Canada, June 11, 1934)

Shoghi Effendi appended a the same letter he had written to the National Spiritual Assembly of the United States and Canada, affirming "the supreme authority of the National Assembly in all matters that affect the interests of the Faith in that land. There can be no conflict of authority, no duality under any form or circumstances in any sphere of Bahá'í jurisdiction whether local, national or international."

1439. I wish to reaffirm, in clear and categorical language, the principle already enunciated upholding the supreme authority of the National Assembly in all matters that affect the interests of the Faith in that land. There can be no conflict of authority, no duality under any form or circumstances in any sphere of Bahá'í jurisdiction whether local, national or international. The National Assembly, however, although the sole interpreter of its Declaration of Trust and by-laws, is directly and morally responsible if it allows any body or institution within its jurisdiction to abuse its privileges or to decline in the exercise of its rights and prerogatives. It is the trusted guardian and the mainspring of the manifold activities and interests of every national community in the Bahá'í world. It constitutes the sole link that binds these communities to the International House of Justice--the supreme administrative body in the Dispensation of Bahá'u'lláh.
(In the hand writing of Shoghi Effendi, appended to a letter dated 11 June 1934 written on his behalf to the National Spiritual Assembly of the United States and Canada)