The Apollinian and the Dionysian are the twin artistic impulses that Nietzsche identifies as fundamental to creation and, more broadly, to life itself. The Apollinian represents the drive toward order, form, and lucid vision, associated with sculpture and the epic poet. In contrast, the Dionysian represents an ecstatic frenzy that dissolves individual identity into a primal, collective unity. This state unleashes the full range of human feeling and “drives forth simultaneously the power of representation, imitation, transfiguration, transformation, and every kind of mimicking and acting” (56). While both are necessary for art, Nietzsche gives special prominence in this work to the Dionysian as the ultimate life-affirming principle.

For Nietzsche, the Dionysian state provides the psychological key to understanding Greek tragedy and the highest form of existence. A tragic artist, imbued with the Dionysian spirit, does not shrink from the terror and suffering of life but says “yes” to it all, finding joy even in destruction. This perspective contrasts with pessimistic philosophies that see tragedy as a reason to negate life. By re-examining these concepts, Nietzsche connects the core aesthetic arguments of his first book, The Birth of Tragedy, to his mature philosophical project, identifying that early work as his very “first revaluation of all values” (101).

Decadence is Nietzsche’s primary diagnostic term for a state of physiological and psychological decline in which life-denying instincts prevail over healthy, life-affirming ones. It is not a moral failing but a condition of diminished vitality, where an individual or culture turns against its own natural impulses. The definitive symptom of this condition, Nietzsche asserts, is the internal conflict that arises when one’s instincts become disordered and must be suppressed through force of will. He provides the formula for this state: “To have to fight the instincts—that is the definition of decadence” (12).

Nietzsche applies this diagnosis to entire eras of Western thought. He identifies Socrates and Plato as ancient decadents whose embrace of “rationality at any price” was a desperate measure to control their own anarchic inner drives (12). He sees the same pattern in Christian morality, which, he argues, wages war on the passions. He further argues that the values he associates with pity, egalitarianism, and “humanization” are not signs of advancement but are instead modern expressions of the same underlying weakness, frailty, and physiological exhaustion that define decadence.

Morality as anti-nature is Nietzsche’s critique of traditional ethical systems, especially Christianity, for being fundamentally hostile to life. He argues that a healthy, natural morality would work with life’s primary instincts, finding ways to refine and channel them. Instead, the dominant moralities of Western civilization have sought to suppress or eradicate them. The Church, he argues, wages war on human passions through “excision in every sense: its practice, its ‘cure,’ is castratism” (21). By attacking the roots of passion, this approach ultimately attacks the roots of life itself, promoting weakness and degeneration under the guise of holiness.

Nietzsche contrasts this anti-natural method with what he calls the “spiritualization” of an impulse. In this affirmative process, a powerful drive like sensuality is not destroyed but refined into a higher cultural expression, such as love. He concludes that all moralities are merely a “language of signs” (37), expressing the physiological condition of the people who created them. Accordingly, an anti-natural morality, which condemns the foundational instincts of existence, for Nietzsche, is a symptom of a declining, weary, and condemned form of life that can only say “no” to its own continuation.

The revaluation of all values is the overarching name for Nietzsche’s philosophical project to systematically overturn the foundational moral, religious, and metaphysical beliefs of Western civilization. He frames this task in the book’s Preface not as a simple critique but as a momentous and burdensome undertaking, symbolized by “this question mark, so black, so huge that it casts a shadow over the man who puts it down” (1). This revaluation is not an act of nihilistic destruction but an attempt to clear away life-denying “idols” to make room for new, life-affirming values. The entire book serves as a “great declaration of war” against these traditional ideals (2), using a philosophical “hammer” to test their soundness and expose their hollowness.

The project operates by diagnosing the psychological and physiological origins of values. Nietzsche argues that ideals like the Christian concept of “good,” the philosophical “true world,” and the moral notion of “free will” are not eternal truths but symptoms of weakness, fear, and decadence. By exposing their unhealthy origins, he seeks to strip them of their authority. The revaluation culminates in the affirmation of this world and this life, replacing a morality of resentment and denial with one based on strength, creativity, and life affirmation.