 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.
