  One important aspect of Albert’s metaphysics appears in his commentary on Aristotle’ Metaphysics. In this work Albert relies heavily on both Averroes in his Long Commentary on the Metaphysics and Avicenna’s Philosophia prima. While the commentary of Averroes is an almost literal analysis of the text of Aristotle, Avicenna’s analysis often departs from this literal approach and incorporates ideas that Avicenna found in Aristotle’s Posterior Analytics. Albert seems to be using Averroes when he is paraphrasing Aristotle’s text, but relies on Avicenna when he departs from the paraphrasing. As a result of this usage Albert proceeds to develop his own ideas of first philosophy as outlined above. This can be seen for example in his analysis of the fifth book of the Metaphysics in his digression on unity found in tractate 1, chapter 8. Following Avicenna he argues that unity cannot be an essential feature of any substance.