The Kitáb-i-Iqán:

Abstract: The Kitáb-i-Iqán (The Book of Certitude), which was designated by Bahá’u’lláh as the Lord of Books that had been revealed by the Most Exalted Pen and called by ‘Abdu’l-Bahá the fountainhead of the water of eternal life, is unique in the history of religions and holy scriptures. This book is not only the key for opening the mysteries of the past Holy Scriptures, but it revolutionizes the concepts of Religion, Eschatology and Theology, by resolving and removing Eschatological barriers and establishing the fundamentals of a Universal Religion and a Universal Theology, that integrates and harmonizes the contending religious ideologies.