Don Quixote de la Mancha was published in 1605, with its second part following a decade later, in 1615. Over four centuries have elapsed, yet this masterpiece of Spanish literature remains one of the most translated and widely celebrated works across various artistic mediums. It has left an indelible mark in literature, visual arts, cinema, theater, music, and dance, captivating not only writers and poets but also philosophers, jurists, politicians, and countless others. What lies behind the enduring success and relevance of this novel? In this book, we endeavor to offer insights into this question, contending that Don Quixote is, above all, a product of its time and milieu: of the Golden Age during the 16th and 17th centuries. We also argue that it stands as a revolutionary work in its narrative and structural innovations. Yet, beyond its literary innovations, Don Quixote features a rich tapestry of characters, who represent the marginalized—peasants, women, Muslims, and more—granting them voice and prominence. It imbues readers with the "madness" of adventure, ideals, and unconditional love. Ultimately, it imparts invaluable lessons, encouraging us not to shy away from doubt or ambiguity but to embrace them as integral aspects of the human experience.