The Kitab-i-iqan, The Book of Certitude, is one of the an important scriptural works in the Baha'i Faith. In it, Baha'u'llah gives a sweeping overview of religious truth, explaining the underlying unity of the world's religions, describing the universality of the revelations humankind has revceived from the Prophets of God, illuminating their fundamental teachings, and elucidating allegorical passages from the New Testament and the Qur'an that have given rise to misunderstanding among religious leaders, practitioners, and the public.