Abstract: With represent by distinction between existence and quiddity and ago Mirdamad, direct and indirect position of muslim philosophers about principality of one of these two or both of them- and also sentences about verbal disagreement among some of them- in their works, are seen. Since mollasadra consider the existence as a principality thing and open the season about principality of existence, the issue of verbal disagreement is seen in some of work of Lahiji, disciple of him, and many of researchers believe that theory. In this article we expose, based on some of interpretation of principality of existence, for they believe objectivity for existence and quiddity, the possibility of verbal disagreement is denied. In some interpretations that the existence has objectivity and it has those qualities, since these qualities are in contrast with qualities of quiddity, the quarrel is real. In this article we survey the relation between verbal disagreement and self-evident of this issue, and we survey this issue that the reasons of principality is in agreement with verbal disagreement or not.