Survey of Western Philosophy: From Socrates to Nietzsche, the Core Thread of Intellectual Evolution
Philosophy’s emergence in ancient Greece marked humanity’s major shift from mythological explanation (Mythos) to rational explanation (Logos). Socrates (470–399 BCE) left not answers but a method — the Socratic Method: through sustained questioning of interlocutors’ assumptions, revealing contradictions and ignorance in their beliefs. “I know only that I know nothing” (though the original formulation is disputed) represents the beginning of philosophical critical reflection.
## Ancient to Medieval: Plato, Aristotle, and the Fusion with Christian Philosophy
**Plato’s** (428–348 BCE) Theory of Forms: visible world objects are imperfect copies of eternal Forms; true reality is the in Forms. His *Republic* envisioned a city-state ruled by philosopher-kings — those who best understand the Form of the Good.
**Aristotle** (384–322 BCE), Plato’s most important student and critic, rejected Forms as independently existing entities, locating universals within particular things. His contributions to logic (syllogism), ethics (virtue ethics — happiness as the actualization of human nature), political philosophy, and scientific method grounded Western intellectual systems for two millennia.
Medieval philosophy centered on theology: Augustine (354–430) fused Platonism with Christianity; Thomas Aquinas (1225–1274) systematically integrated Aristotleanism with Christianity — his *Summa Theologica* is the medieval pinnacle and a classic exploration of reason and faith.
## Early Modern to Modern: Rationalism, Empiricism, and Enlightenment
Descartes (“I think therefore I am,” *Cogito ergo sum*) grounded modern philosophy in radical doubt; Spinoza developed pantheism; Leibniz proposed monadology. Against this, the British empiricists Locke, Hume, and Berkeley held that knowledge derives from sensory experience, not innate reason.
**Kant** (1724–1804) synthesized rationalism and empiricism: time, space, and causality are a priori forms the mind imposes on experience, not independent attributes of the external world — a “Copernican Revolution in philosophy.” Consult the [Stanford Encyclopedia of Philosophy](https://plato.stanford.edu/) for depth on any philosophical topic.
**Nietzsche’s** (1844–1900) “God is dead” was not simple atheism but a diagnosis of the collapse of Western value foundations — Christian morality — in modernity, and a call for humanity to create new values (will to power, the Übermensch). His genealogical critique of morality deeply influenced 20th-century existentialism and postmodernism.
