One of the most important debates between a mystic and a philosopher is on the essence of "necessary being on itself"; they both believe the essence of the necessary being is its existence and believe a necessary being, unlike possible beings, does not have two aspects of existence and essence; rather they say the essence of a necessary being is exactly the same as its existence. But mystics and philosophers disagree on the existence which is identical with the essence of necessary. Mystics say the existence which is identical with the essence of the necessary on itself is a "labeshart" (non_conditioned) existence which has no determination and philosophers believe the existence which is identical with the essence of the necessary on itself is a special being which is, because of the characteristics of a necessary being, distinctive from other realities. The idea of philosophers seems to be false and the view of mystics is logical and acceptable and it has or may have-some proofs.