 Other than in the summae, Avicenna wrote comprehensively on all philosophy in two major and massive works, both in about twenty volumes, both now lost. The first was his youthful commentary on the works of Aristotle which he wrote upon commission by his neighbor Baraqī, mentioned above, The Available and the Valid [of Philosophy]. The second, Fair Judgment (GS 11), composed in 1029, was a detailed commentary on the “difficult passages” of the entire Aristotelian corpus, in which was included even the suspect Theology of Aristotle (actually Plotinus’ Enneads IV–VI). The title refers to Avicenna’s adjudication between traditional Aristotelian exegeses and Avicenna’s own views by presenting arguments in support of the latter. As Avicenna explains his title, “I divided [in the book] scholars into two groups, the Westerners [the Greek commentarial tradition and the Baghdad Aristotelians] and the Easterners [Avicenna’s positions], and I had the Easterners argue against the Westerners until I intervened to judge fairly when there was a real point of dispute between them” (GS 14, 375; transl. Gutas 2014a, 145). The book was unfortunately lost during some military rout, and only the commentary on Book Lambda, 6–10, of Aristotle’s Metaphysics survives (GS 11a; Geoffroy et al. 2014), along with two incomplete recensions of his commentary on the Theology of Aristotle (GS 11b; Vajda 1951). Some marginal notes on De anima, surviving independently as transcribed in a manuscript, have the same approach and manifestly belong to the same period and project (GS 11c; Gutas 2004b).