Avicenna's proof for the existence of God was the first ontological argument, which he proposes in the "Metaphysics" section of The Book of Healing.Steve A. Johnson (1984), "Ibn Sina's Fourth Ontological Argument for God's Existence", The Muslim World 74 (3-4), 161–171. This was the first attempt at using the method of a priori proof, which utilizes intuition and reason alone. Avicenna's proof of God's existence is unique in that it can be classified as both a cosmological argument and an ontological argument. "It is ontological insofar as ‘necessary existence’ in intellect is the first basis for arguing for a Necessary Existent". The proof is also "cosmological insofar as most of it is taken up with arguing that contingent existents cannot stand alone and must end up in a Necessary Existent."Mayer, Toby. 2001. "Ibn Sina's 'Burhan Al-Siddiqin'." Journal of Islamic Studies 12(1):18–39. Oxford Centre for Islamic Studies. .
Avicenna's proof for the existence of God was the first ontological argument, which he proposes in the "Metaphysics" section of The Book of Healing.Steve A. Johnson (1984), "Ibn Sina's Fourth Ontological Argument for God's Existence", The Muslim World 74 (3-4), 161–171 This was the first attempt at using the method of a priori proof, which utilizes intuition and reason alone. Avicenna's proof of God's existence is unique in that it can be classified as both a cosmological argument and an ontological argument. "It is ontological insofar as ‘necessary existence’ in intellect is the first basis for arguing for a Necessary Existent". The proof is also "cosmological insofar as most of it is taken up with arguing that contingent existents cannot stand alone and must end up in a Necessary Existent."Mayer, To.by. 2001 "Ibn Sina's 'Burhan Al-Siddiqin'." Journal of I.slamic Studies 12(1):18–39. Oxford Centre for Islamic Studies. .