The book "Guidance for the Disciple in the Transformation of Slaves" by Imam Abu Hamid al-Ghazali is not merely a relic of ancient medicine or physiognomy. Rather, it is an intellectual and spiritual journey into understanding the human body, soul, and mind. In this unique work, al-Ghazali reveals his encyclopedic genius, blending the wisdom of a physician, the insight of a philosopher, and the inspiration of a mystic to present the reader with a comprehensive vision of the meaning of moderation, health, and human balance. Al-Ghazali contemplates the details of the body-skin color, eye movement, voice rhythm, physique, and mood-not only to describe them, but also to reveal the profound relationship between the outward and the inward, between the body we see and the spirit that animates it. In a captivating and profound style, the book re-poses the eternal question: How do we maintain our inner balance amidst the chaos of life? And how can knowledge of the body become a path to knowledge of the soul and its Lord? Reading this book is not only a journey into ancient medicine, but also a spiritual intellectual experience that brings a person back to himself and makes him realize that moderation is the secret of beauty and the core of faith.