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Naturally, humans are capable of entertaining thoughts, or believing in propositions, about particular individuals or objects. Sometimes they express these thoughts or propositions by uttering declarative subject- predicate sentences, such as “hafiz was a poet” /or/ ”you are reading a book”. It seems to be that occasions in which people entertain thoughts by uttering sentences of subject- predicate form, like “ the round square is round”. And “the golden mountain is high.” But there is a general problem as to how one can say something about that which does not exist. According to a great number of Muslim philosophers, it is because of the “mental being” of non- existing entities and of the presence of their quiddity before the mind that we can make any assertion about these entities. We can express the proposition containing them by subject-predicate sentences. In this article, the author will show that the ontological argument of Muslim philosophers is both incapable of resolving the aforementioned problems, and unable to give a correct explanation of the theory of “mental being”