 The canonical texts are the writings of the Báb , Bahá 'u'lláh , `Abdu 'l @-@ Bahá , Shoghi Effendi and the Universal House of Justice , and the authenticated talks of `Abdu 'l @-@ Bahá . The writings of the Báb and Bahá 'u'lláh are considered as divine revelation , the writings and talks of `Abdu 'l @-@ Bahá and the writings of Shoghi Effendi as authoritative interpretation , and those of the Universal House of Justice as authoritative legislation and elucidation . Some measure of divine guidance is assumed for all of these texts . Some of Bahá 'u'lláh 's most important writings include the Kitáb @-@ i @-@ Aqdas , literally the Most Holy Book , which is his book of laws , the Kitáb @-@ i @-@ Íqán , literally the Book of Certitude , which became the foundation of much of Bahá 'í belief , the Gems of Divine Mysteries , which includes further doctrinal foundations , and the Seven Valleys and the Four Valleys which are mystical treatises . 
