Bahá’u’lláh’s Kitáb-i-Íqán is one of the "foremost" among the works of His Revelation. It "contains the basic tenets of the Faith" and "explains the attitude" of the Bahá’í Faith to "the prophets of God and their mission in the history of society." It affirms "the unity of the Prophets, the universality of their Message, the identity of their fundamental teachings, the sanctity of their scriptures, and the twofold character of their stations." It elucidates many allegorical passages in the New Testament and Qur’án. Shoghi Effendi, the Guardian of the Bahá’í Faith, said books such as the Íqán "should be read and read over again by every soul who desires to serve" the Faith and that "every Bahá’í should master" the Íqán’s contents.