 Despite his peregrinatory life spent in historically turbulent times and areas, including the frequently unfavorable personal circumstances in which he found himself (as recounted in the Autobiography and Biography, Gohlman 1974), Avicenna was terribly productive, even by the standards of the highly prolific authors writing in Arabic in medieval Islam. In the Autobiography he says that by the time he was eighteen he had mastered all subjects in philosophy without anything new having come to him since (Gohlman 1974, 30–39). Even though the Autobiography has particular philosophical points to make (discussed in the next section), this is no mere boast. There are reports that he wrote major portions of his greatest work, The Cure, without any books to consult (Gohlman 1974, 58; transl. and analysis Gutas 2014a, 109–115), that he composed in a single night, dusk to dawn, a treatise on logic in one hundred quarto (large size) pages (Gohlman 1974, 76–81), and that he compiled The Salvation (GS 6) “en route”—on horseback, manifestly, or during rests from riding—in the course of a military expedition in which he had accompanied his master, ʿAlāʾ-ad-Dawla (Gohlman 1974, 66–67). Exaggerated and hagiographic as some of these reports might be, it is clear that Avicenna had constructively internalized (not to say “memorized”) the philosophical curriculum and he could reproduce it, properly assimilated and analytically reconstructed, at will. This is also evident in his disregard (rather than neglect?) for keeping copies of his works; as it must have happened rather frequently, when commissioned or asked to write about a subject that he had treated earlier, it was apparently just as easy for him to compose a treatise anew as it was to copy an earlier version of it. Avicenna could write fast and with great precision, sacrificing nothing in analytical depth. At the same time, however, given his undisputed fame and immense intellectual authority that he exercised soon after his death, pseudepigraphy became a major factor multiplying the works attributed to him (Reisman 2004 and 2010). Accordingly, some medieval bibliographies of his works (and some modern ones, based on the former) list close to three hundred titles, though a recent sober tally of them brings the authentic writings down to fewer than one hundred, ranging from essays of a few pages to multi-volume sets, and flags the pseudepigraphs that need to be assessed and authenticated (Gutas 2014a, Appendix, 387–540). Much work still remains to be done in this regard.