Truthiness of God in Avicenna's View and Its Influence on the Theory of Unity of Existence in Mulla Sadra

The unity of existence is one of the disputed issues in Islamic Mysticism and philosophy. This subject has appeared somehow in Sadrian philosophy (known as Transcendental Philosophy) as the Islamic mainstream which gathered its previous Islamic ideas. One of the questions here is about the roots of this discussion in Islamic philosophy; a question that is meant to be answered in this article according to a discussion in Avicenna which may be called “truthiness (haqqiyah) of God”. It seems that the Quranic trends which dominates the discussion (i.e. truthiness of God) is the very thing that has led to the distinction of truth (haq) and void (batil) in Islamic philosophy; the distinction which was interpreted as a distinguishing between “existence” and “non-existence”. This distinction finally led to an exclusive view in attributing “existence” to God and result in a smooth kind of belief about unity of existence in Mulla Sadra.