This scholarly work by Prof. Dr. Amer Abdel Zaid Al-Waeli meticulously traces the monumental shift in Greek thought, from the mythological narratives of Mythos to the rational, philosophical reasoning of Logos. The book delves into the core philosophical debates that defined this transition, examining the key thinkers and movements that championed logic and critical inquiry. It explores how early Greek philosophers challenged traditional beliefs, laying the foundational principles of Western philosophy. This is an essential read for students and scholars interested in the origins of philosophical thought and the birth of rationalism in ancient Greece.