This book starts with the classification of the main views of different thinkers after the study of the original materials, which covers all the thinkers’ thoughts and conceptions. A major objective of this book is to reveal the ideas of the philosophers. Key ideological opinions are stated with the former discussion of exact questions and further clarification of their philosophical meaning, which enables the readers to better understand the meaning and value of the philosophical thoughts. Since the logic and history are in accordance with each other, a frame of conception is formed then. Then, the author clearly explains the logical relationship in the frame mentioned before, as well as the formation of the key concepts and their relationship.