This memorable collection of quotations is a treasure trove of insight and wisdom by ninety great philosophers of Western civilization: Nicola Abbagnano, Theodor W. Adorno, Alain, Henri-Frederic Amiel, Saint Thomas Aquinas, Hannah Arendt, Aristotle, Saint Augustine, Marcus Aurelius, Sir Alfred J. Ayer, Gaston Bachelard, Francis Bacon, Roger Bacon, Simone de Beauvoir, Walter Benjamin, Jeremy Bentham, Nicolai A. Berdyaev, Henri Bergson, F. H. Bradley, Giordano Bruno, Edmund Burke, Albert Camus, Elias Canetti, Pierre Charron, Nikolai Gavrilovich Chernyshevsky, Cicero, E. M. Cioran, R. G. Collingwood, Ralph J. Cudworth, John Dewey, Rene Descartes, Denis Diderot, Diogenes of Sinope (The Cynic), Ralph Waldo Emerson, Friedrich Engels, Epictetus, Frantz Fanon, Ludwig Feuerbach, Michel Foucault, Georg Hegel, Martin Heidegger, Heraclitus, Thomas Hobbes, Eric Hoffer, David Hume, William James, Immanuel Kant, Soren Kierkegaard, Georg Christoph Lichtenberg, John Locke, Lucretius, Niccolo Machiavelli, Moses Maimonides, Joseph de Maistre, Herbert Marcuse, Jacques Maritain, Karl Marx, John Stuart Mill, Michel de Montaigne, Charles de Montesquieu, Lewis Mumford, Friedrich Nietzsche, Jose Ortega y Gasset, Blaise Pascal, Jan Patocka, Philo of Alexander, Plato, Thomas Reid, Jean-Jacques Rousseau, Bertrand Russell, George Santayana, Jean-Paul Sartre, Friedrich Schlegel, Arthur Schopenhauer, Seneca, Socrates, Herbert Spencer, Benedict Spinoza, Henry David Thoreau, Alexis de Tocqueville, Leo Tolstoy, Miguel de Unamuno, Giambattista Vico, Voltaire, Alan Watts, Otto Weininger, Alfred North Whitehead, William of Occam, Ludwig Wittgenstein, and Xenocrates.