Part one covers topics such as the one universal law that governs nature, rational and spiritual proofs of the existence of God,[4] Manifestations of God[5] (Abraham,[6] Moses,[7] Christ,[5] Muhammad,[9] (includes His wives and battles), the Báb,[10] and Baháʼu'lláh),[11] and Biblical prophecies from chapters 8, 9 and 12 of the Book of Daniel (see Day-year principle),[12] chapter 11 of the Book of Isaiah and chapters 11 and 12 of the Book of Revelation.[13][14][15]