Friedrich Nietzsche (1844–1900) was indisputably one of the most influential, complex, and radical philosophers of the nineteenth century and the entirety of human intellectual history. Known for philosophizing with a hammer, Nietzsche sought to dismantle the traditional foundations of Western metaphysics, Christian morality, and conventional societal norms. His fierce critique of dogmatic rationalism provided the spark for modern intellectual movements that fundamentally altered humanity's understanding of existence, ethics, and human freedom. Biographically and historically, Nietzsche was born in Röcken, Prussia (modern-day Germany), into a devout Lutheran family. Although his father was a pastor, Nietzsche pursued classical philology in his youth and remarkably achieved a full professorship at the University of Basel in Switzerland at the age of 24. However, suffering from severe chronic health conditions, including blinding migraines and failing eyesight, he retired from academia to live an itinerant life across Swiss and Italian mountain regions, dedicating himself entirely to writing his groundbreaking masterpieces. His prolonged physical suffering and profound isolation deeply shaped his philosophical output. At the core of Nietzsche's philosophical architecture is the diagnosis of a looming civilizational crisis: Nihilism. Nietzsche recognized that the decline of religious authority and metaphysical guarantees during the Enlightenment left Western society facing an unprecedented collapse of foundational values—a condition famously captured in his aphorism 'God is dead.' He warned that this ideological vacuum would inevitably lead to despair and meaninglessness unless individuals courageously stepped forward to construct new, life-affirming values. In response to the threat of nihilism, Nietzsche introduced the concept of the 'Übermensch' (Overman or Superman) alongside the 'Transvaluation of All Values.' The Übermensch represents an individual who overcomes suffering, breaks free from the constraints of 'slave morality,' and independently creates meaning through self-mastery. This figure remains faithful to the earth, deriving beauty and strength from worldly existence rather than relying on otherworldly consolations. Furthermore, the doctrines of the 'Will to Power' and the 'Eternal Recurrence' serve as fundamental pillars of his worldview. Nietzsche postulated that the primary driving force in nature and human psychology is not mere survival, but the drive toward expansion, mastery, and self-overcoming. Complementarily, his thought experiment of Eternal Recurrence challenges individuals to live in such a way that they would willingly embrace repeating every single detail of their lives, with all its joys and agony, infinitely. The impact of Nietzsche's philosophy on modern society, ethics, and culture is profound. His writings laid the groundwork for 20th-century Existentialism, directly influencing thinkers such as Jean-Paul Sartre, Albert Camus, and Martin Heidegger. In psychology, pioneers like Sigmund Freud and Carl Jung drew heavily from his insights into the unconscious mind and self-actualization. Nietzsche liberated human thought from passive moral conformity, urging humanity toward sovereign self-determination.