Manifestation of God are the greatest proof of His mission and the writings of the Báb comprise over two thousand tablets, epistles, prayers, and philosophical treatises. These writings form part of Baha'i scripture, particularly his prayers, which are often recited individually as well as in devotional gatherings. The works of the Báb have also excited scholarly interest and analysis. Elham Afnan describes the writings of the Báb as having "restructured the thoughts of their readers, so that they could break free from the chains of obsolete beliefs and inherited customs". Jack McLean notes the novel symbolism of the Báb's works, observing that "The universe of the Báb's sacred writings is pervasively symbolic. Numbers, colors, minerals, liquids, the human body, social relationships, gestures, deeds, language (letters and words), and nature itself are all mirrors or signs that reflect the profounder reality of the names and attributes (asmá va sifát) of God". The Báb's works are characterised by linguistic innovation, including many neologisms whenever He found existing theological terms inadequate. Free association and stream-of-consciousness-style composition are marked features of some works. Several scholars have identified the continual repetition of particular words or phrases of religious importance to be a distinct feature throughout the Bab's writings. The Báb himself categorised his writings into five modes: divine verses, prayers, commentaries, rational discourse — written in Arabic — and the Persian mode, which encompasses the previous four. Scholars have noted commonalities between the Báb's writings and those of Western philosophers such as Hegel, Kant) and James Joyce Most of the writings of the Báb have been lost, however. The Báb himself stated they exceeded five hundred thousand verses in length; the Quran, in contrast, is 6300 verses in length. If one assumes 25 verses per page, that would equal 20,000 pages of text. Nabíl-i-Zarandí, in The Dawn-breakers, mentions nine complete commentaries on the Quran, revealed during the Báb's imprisonment at Maku, which have been lost without a trace. Establishing the true text of the works that are still extant, as already noted, is not always easy, and some texts will require considerable work. Others, however, are in good shape; several of the Báb's major works are available in the handwriting of his trusted secretaries. Most works were revealed in response to specific questions by Bábís. This is not unusual; the genre of the letter has been a venerable medium for composing authoritative texts as far