Perhaps, “Monotheism” and “its truth” can be regarded as the most controversial topics in the area of theology, philosophy and theoretical mysticism. Meanwhile, there are lots of different views and disagreements between theologians, philosophers and mystics, to which many works are dedicated. Theologians and Peripatetic philosophers accepted the separation (Beynoonat) between the Creator and Creature. Ishraqi thinkers believe in some kinds of unity that include multiplicity. Following Fahlavyoon, Mulla Sadra, the founder of “Transcendental Wisdom” (al-Hekmat al-Muta’aliyah), propounded the gradational unity and afterward influenced by mystics, a kind of personal unity of existence (al-Wahdat al-Shakhsi). Mystics also regard the personal unity of existence as the most accurate opinion. One of the contemporary thinkers, Allamah Mohammad Taqi Jafari, has discussed this subject sporadically in his works, and apparently has tried to oppose the idea of personal unity of existence. In this article, we bring up and review his points of view as well as reconstructing his perspective on the "relation between the Creator and creature." We concluded that Allamah Jafari's views should be considered in two aspects. He criticizes the "Unity of existence" with a pantheist view in the first stage, while in the second he accepts the personal unity of existence.