Abū ‘Alī ibn Sīnā (d. 428/1027) is regarded as the most influential philosopher in Islamic intellectual history. Of his numerous contributions, none has garnered more attention than ontological proof for existence of God, known ‘the Demonstration Truthful’ (Burhān al-ṣiddiqīn). In this proof, Ibn argues that only one being can be ‘necessarily existent’ (wājib al-wujūd). He goes on to say all at...