SOURCE: "Avicenna's Proof of the Existence of God as a Necessarily Existent Being," in Islamic Philosophical Theology, edited by Parviz Morewedge, State University of New York Press, 1979, pp. 165-87.

In the following essay, Davidson insists that, although Avicenna purports to prove God's existence based on the concept of a necessarily existent being, his ontological argument is rather a kind of cosmological proof

Nizami-i-'arudi, in the Chahar Maqala (written in the Mid-twelfth Century), Compares Avicenna Favorably to Aristotle:

For four thousand years the physicians of antiquity travailed in spirit and spent their very souls in order to reduce the science of Philosophy to some fixed order, yet could they not effect this; until after the lapse of this period that pure philosopher and most great thinker Aristotle weighed out this coin in the balance of Logic, assayed it with the touchstone of Definitions, and measured it with the measure...