One of the most important and difficult legal and philosophical issues is the explanation of the "detailed science of the supreme right of creatures at the level of essence". In his books, Sadr al-Mutalahin has put forward two theories about this issue: one is his famous theory, which is "abstract knowledge while exploring details" and the other is a theory based on the union of the wise and reasonable, which is considered his final theory. In this article, the author first explained his basic and famous theory based on the principles of Sadr al-Mutalahin and then examined and criticized this theory from the point of view of Professor Fayazi. Mullasadra has explained the theory of "general knowledge in the aim of detailed discovery" by using the rule of "Basit al-Haqiqah" and based on the original principles of transcendental wisdom (especially the originality of existence).