Although different perspectives on the essence and qualities of the absolute existence have been put forward by the philosophers, theologians, and Sufī philosophers, in the context of this article, we will examine whether absolute existence has a causal efficacy in addition to special existence in the unity of the First Principle and the first effect. We will discuss the views of two Ottoman scholars, Baghdādīzāda (who lived in the second part of the 10th/16th century) and Arpacīzāda (d.1033/1623), who analyzed the (...) effect of absolute existence with its aforementioned qualities on the simplicity of the First Principle and its being a part of the complete cause as an incomplete cause. It is generally accepted by the philosophers that the First Principle is the simple complete cause of the first effect by virtue of its essence without the need for conditions, tools, or the removal of any obstacle. Therefore, the First Principle must be the cause of the first effect with its simple existence that does not consist of any sensory or intellectual parts. Therefore, the decisive issue in the discussions regarding the definition of the complete cause is the inclusion of both simple and compound entities. Because the definition of a complete cause that includes only simple or compound causes would be incomplete since it does not include all entities. The definition of complete cause preferred by philosophers such as al-Asīr al-Dīn al-Abharī (d.663/1265) and Najm al-Dīn al-Kātibī (d.675/1277), who made important contributions to the conceptualization of complete and incomplete causes, as the totality of the things on which the maʿlūl depends in its existence, can only include composite entities. As a matter of fact, al-Sayyīd Sharīf al-Jurjānī (d.816/1413), in his Sharh al-Mawāqif and Hāshiya al-Tajrīd, states that the aforementioned definition of complete cause, which was mentioned by his predecessors al-Abharī and al-Kātibī has the possibility of including only composite entities, but he expresses that this situation is not a necessity with the example that a simple substance can be formed from a simple complete cause. The Ottoman scholar al-Khatībzāda (d.901/1496), who supported al-Jurjānī's sentiment that the aforementioned definition of the complete cause could only include composite entities, emphasized in his commentary on Tajrīd al-iʿtikād the possibility of accepting absolute existence as a necessary element for the realization of the complete cause, which led to the writing of separate treatises following the traces of this problem. In the context of al-Jurjānī and al-Khatībzāda's explanations, al-Baghdādīzāda addressed the possibility of absolute existence being a part of the complete cause without damaging the simplicity of the First Principle and wrote a separate treatise emphasizing that absolute existence does not eliminate the First Principle”s being a simple complete cause. Arpacīzāda was another Ottoman scholar who wrote a critical text in response to this treatise, which analyzed the effect of absolute existence on the existence of the first effect as a part of the complete cause and its relation to the special existence of the First Principle. In this article, we will try to reveal the effect of absolute existence on the First Principle's being a simple complete cause and the possibility of accepting it as a part of the complete cause through these individuals and treatises. (shrink)