A central theme of the work is the historical development of moral systems, specifically the distinction between and Slave Morality :

Friedrich Nietzsche’s Beyond Good and Evil (1886) is a seminal work that challenges the foundations of Western morality and traditional philosophy. Subtitled "Prelude to a Philosophy of the Future," the book serves as a critique of past philosophers for their uncritical acceptance of dogmatic morality and as a call for "free spirits" to create a new, life-affirming value system. The Critique of Traditional Philosophy

Nietzsche begins by questioning the "will to truth" that has long driven philosophers. He argues that most philosophical systems are not objective searches for truth but are instead a "spiritualized will to power"—a projection of the philosopher’s own personal values and physiological needs onto the world. He famously targets figures like Plato and Spinoza, accusing them of masking their subjective moral prejudices with logical or mathematical facades. Master and Slave Morality