Tolerance emerged from the carnage of Europe's religious wars, was refined by Locke, Voltaire, and Mill, and became a pillar of modern liberal society. Yet the paradox of tolerating the intolerant remains unresolved.
Kant transcended the deadlock between rationalism and empiricism with his 'Copernican revolution'—the thesis that objects conform to our cognition, not the reverse. Through three Critiques he charted the reach and limits of reason, and with the categorical imperative grounded morality in reason alone.
Arendt analyzed the origins of totalitarianism, coined 'the banality of evil' from the Eichmann trial, and defended the public realm where plural human beings speak and act together.
Nietzsche diagnosed the nihilism that follows the death of God, unmasked the origins of morality through genealogy, and sought a total affirmation of life through the ideas of eternal recurrence and the Übermensch.
Hobbes depicted the state of nature as a war of all against all, and derived the social contract and absolute sovereignty from fear and reason alone. The starting point of modern political philosophy.
Francis Bacon diagnosed the structural distortions of the human mind with his Four Idols and redesigned the method of learning from the ground up through induction.
In the thirteenth century, Thomas Aquinas integrated Aristotelian philosophy into Christian theology and systematized the harmony of faith and reason through the Five Ways and natural law.
In the thirteenth century, Roger Bacon exposed four obstacles to truth—blind deference to authority, the force of habit, popular prejudice, and the concealment of ignorance behind a display of apparent wisdom—and insisted that knowledge must be verified by experience.
Augustine found the battlefield of philosophy inside his own soul. The will rebels against itself; time exists only in memory. Evil is not a substance but the absence of good.
Nagel showed, through the deceptively simple question of what it is like to be a bat, that the subjective character of consciousness cannot be captured in any physical description.
In 1637, an anonymous book shattered inherited certainty. Descartes subjected sensation, memory, and even mathematics to radical doubt, then found one indestructible point: the existence of the doubting self.
In 399 BCE Socrates stood before an Athenian jury of over 500 citizens, charged with impiety and corrupting the youth. Plato's Apology records how, facing a death sentence, the philosopher declared that 'the unexamined life is not worth living' and refused to abandon his mission of inquiry to the very end.
Diogenes lived in a storage jar, held up a lantern in broad daylight and said 'I am looking for a human being.' He stripped away property, honor, and shame, proving through his body alone that philosophy is a way of life.
Seneca's De Ira condemns anger as 'a brief madness,' breaks down its mechanism into three stages, and sets out concrete techniques for prevention and cure across three books.
As Nero's tutor and de facto regent, Seneca stood at the centre of imperial power while dispensing Stoic prescriptions for time, anger, and death. The contradiction between his vast wealth and his sermons on frugality is precisely where his practical philosophy — philosophy that refuses to stay in the study — draws blood.
Epicurus inherited Democritus's atomism while placing 'pleasure' as the criterion of the good, and founded a philosophy that dispels the fear of death and dread of the gods. His thought connects deeply to modern science, utilitarianism, and existential inquiry.
Zeno of Citium made 'living in accordance with nature' the foundational principle of ethics and founded Stoic philosophy, which holds virtue alone to be good. His thought passed through the Roman Empire to influence modern ethics and cognitive behavioural therapy.
Aristotle critically inherited Plato's theory of Forms and single-handedly constructed a comprehensive system spanning metaphysics, logic, ethics, natural philosophy, and politics. Through the four causes and the framework of potentiality and actuality he explained being and change, and with the doctrine of the mean and eudaimonia he laid the foundations of Western ethics.
Democritus explained all things by means of indivisible atoms and the void, answering Parmenides' challenge while laying the groundwork for a materialist worldview that anticipated modern science.
Parmenides started from the principle 'what is, is; what is not, is not'.
Heraclitus discovered the logos (rational law) behind the ceaseless change of all things, and taught that the cosmos is governed by the unity of opposites and the transformations of fire.
Pythagoras discovered the laws of the universe in musical ratios and proclaimed 'All things are number,' forging the bond between philosophy, mathematics, and science.
Set on the day of Socrates' execution, Plato's Phaedo develops four arguments for the soul's immortality.
Bergson reconceived lived time through 'duration,' offering a new perspective on modern science's understanding of time and consciousness.
Machiavelli analyzed politics as it works in practice, not as moral ideal, and established a modern realist method of power.
Plato framed reality through the Forms and built philosophy as dialogue, shaping Western thought through the Academy and beyond.
Nishida moved from “pure experience” to the “place of absolute nothingness,” forging a major synthesis of Zen and modern philosophy.
Socrates wrote nothing, yet through relentless dialogue he exposed false knowledge and redirected philosophy toward lived inquiry.
Xenophanes attacked anthropomorphic gods and stressed the limits of certainty, laying foundations for skepticism and religious critique.
Anaximenes named air as the archē and explained change through condensation and rarefaction, advancing early scientific method.
Anaximander criticized Thales’s “water” and proposed the Boundless (to apeiron), inaugurating abstract thought in Greek philosophy.
Thales explained the world through nature, not myth, and launched the search for archē that opened both philosophy and science.
