One of the most difficult topics in metaphysic is that how multiplicity of beings has been aroused from simple reality. Sufism Moslem scholars like Mohyedin Arabi has a special viewpoint which called ‘Individual unity of existence theory’. Mullah Sadri axiomatized this theory through the principles of his philosophy and defended of its rationality.
In this paper I will show that individual unity of existence theory has three main problematic consequences; first, denial of casualty; second, fatalism; and third, Panentheism. So in this essay finally will be shown that accepting the theory will be ended up in atheism so will be resulted in anti-rationalism
