January 11. On this date on 1942 Shoghi Effendi wrote "the whole theory of Divine Revelation rests on the infallibility of the Prophet, be He Christ, Muhammad, Bahá'u'lláh, or one of the others. If they are not infallible, then They are not Divine, and thus lose that essential link with God..."

January 11. On this date on 1942 Shoghi Effendi wrote (also here) "the whole theory of Divine Revelation rests on the infallibility of the Prophet, be He Christ, Muhammad, Bahá'u'lláh, or one of the others. If they are not infallible, then They are not Divine, and thus lose that essential link with God..."

1572. The Whole Theory of Divine Revelation Rests on the Infallibility of the Prophets
"Regarding your Bahá'í friend who does not fully understand the infallibility of the Manifestation of God: You should influence that person to study the matter more deeply, and to realize that the whole theory of Divine Revelation rests on the infallibility of the Prophet, be He Christ, Muhammad, Bahá'u'lláh, or one of the others. If they are not infallible, then They are not Divine, and thus lose that essential link with God which, we believe, is the bond that educates men and causes all human progress."
(From a letter written on behalf of the Guardian to an individual believer, January 11, 1942)

Also here...

1844. Spiritual Education and Progress Depend on Recognition of the Infallibility of the Manifestation of God
"Regarding your Bahá'í friend who does not fully understand the infallibility of the Manifestation of God: You should influence that person to study the matter more deeply, and to realize that the whole theory of Divine Revelation rests on the infallibility of the Prophet, be He Christ, Muhammad, Bahá'u'lláh, or one of the Others. If They are not infallible, then They are not divine, and thus lose that essential link with God which, we believe, is the bond that educates men and causes all human progress."
(From a letter written on behalf of Shoghi Effendi to an individual believer, January 11, 1942)