In this book, the writer highlights to us the importance of the pivotal role that the mind plays in understanding the beings that the ontology study "the study of existence" is concerned with, as it is one of the basic philosophical topics. The writer agrees with the philosophical point of view that says: rational knowledge is superior to sensory knowledge, given that the mind A human being possesses a power that enables it to perceive various types of intangible knowledge, and the writer links existents to the role that the mind plays in perceiving these existents. This is based on the fact that the mind is the chief manager of the affairs of governance over existing beings, such as plants, animals, and others. That is: He is the judge who has the final say in ruling on assets and the principles and sections that flow from them.

يوسف بطرس كرم هو مفكر ومؤرخ وفيلسوف مصري، أضاء غُرَّةَ التاريخ الفلسفي بمذهبه العقلي؛ وشغل مَنْزلةً مرموقةً بين المثقفين المصريين، واضطلع بمهمة دراسة الفكر الفلسفي الغربي؛ فلم يترك حقبة في تاريخه إلا وكتب عنها، وهو يعد واحدًا من أبرز مؤسسي الفكر الفلسفي في الوطن العربي، وتعد كتاباته علامة فارقة في أدبيات الفلسفة باللغة