Philosophical Quotes Wisdom from history's greatest thinkers Filter by philosopher: All Philosophers Albert Camus Aristotle Confucius Epictetus Friedrich Nietzsche Hannah Arendt Immanuel Kant Jean-Paul Sartre Lao Tzu Ludwig Wittgenstein Marcus Aurelius Martin Heidegger Plato René Descartes Seneca Simone de Beauvoir Socrates Søren Kierkegaard Filter by category: All Categories Aesthetics Epistemology Ethics Existentialism Metaphysics Philosophy of Language Political Philosophy Stoicism "I know that I know nothing." The Socratic paradox expressing intellectual humility. Epistemology "To find yourself, think for yourself." Ethics "Life can only be understood backwards; but it must be lived forwards." Existentialism "Anxiety is the dizziness of freedom." Existentialism Previous