someone believes in the personal unity of existence as one of the key beliefs emphasized by Sadr al-Mutalahin, meaning that he perceives the unity of beings in the world as a single being, this belief will affect his mind. Since the human mind has three dimensions: cognitive, emotional, and volitional, it can be said that such a person considers himself equal to other humans and beings in the cognitive dimension, and the world will be mysterious and full of awareness for him. But seeing oneself as equal to other beings in the emotional sphere of the human mind creates a sense of compassion and empathy, a pervasive love, and absolute peace. In the volitional sphere, such a person finds a desire for perfection in the first place and a desire for free in the second place. In this article, with a therapeutic approach and using an analytical and deductive method, we have examined the psychological effects and results of the unity of existence. Mullasadra himself has also referred to some of these effects on the human mind due to the belief in the unity of existence. These psychological effects can be used as a basis for increasing mental health, expanding peace, and environmental ethics in human society.