Ascribing Existence to Quiddity in Sadra's Thought

According to presupposition rule ascribing a quality to anything presupposes its subject. One instance of this rule is the ascription of being to quiddity which raise objections from early times among Islamic philosophers and received different answers. Having examined these arguments Mulla Sadra offered four responses to the above-mentioned problem: 1. This not the case for application of presupposition rule since existential proposition indicates the reality of something not a ascription of something to another. 2. The rule of presupposition applies only to the accidents of existence not to those of quiddities. 3. According to the fundamental reality of existence quiddity has no true reality so as to be subject to the presupposition rule. 4. Reason can consider quiddity as such devoid of any external or even mental subsistence therefore quiddity lacks any form of reality and cannot be a case for presupposition rule.