Appendix quotes authors: Alain; Dante Alighieri; Woody Allen; Amiel Henry F .; Sir Francis Bacon; Jaime Luciano Balmes; Honore de Balzac; Pio Baroja; Charles Baudelaire; Simone de Beauvoir; Gustavo Adolfo Becquer; Ludwig van Beethoven; Jacinto Benavente; Mario Benedetti; Benedict XVI; Ambrose Bierce; William Blake; Nicolas Boileau; Simon Bolivar; Jorge Luis Borges; Jacques Benigne Bossuet; Ray Bradbury; Bertolt Brecht; Anthelme Brillat-Savarin; Jean de la Bruyere; Buddha; Charles Bukowski; Edmund Burke; Pedro Calderon de la Barca; Ramon de Campoamor; Albert Camus; Thomas Carlyle; Alexis Carrel; Alejandro Casona; Camilo Jose Cela; Miguel de Cervantes; Chamfort; Rene de Chateaubriand; Earl of Chesterfield; Gilbert Keith Chesterton; Winston Churchill; Cicero; Domenico Cieri Estrada; Clarasó Noel; Georges Clemenceau; Jean Cocteau; Paulo Coelho; Confucius; Joseph Conrad; Pierre Corneille; Cortazar Julio; Albert Einstein; George Eliot; Emerson; Phrygia Epictetus; Epicurus of Samos; Erasmus of Rotterdam; Euripides of Salamis; William Faulkner; Fenelon; Francis Scott Fitzgerald; Gustave Flaubert; Le Bouvier Bernard Fontenelle; Henry Ford; Anatole France; Benjamin Franklin; Sigmund Freud; Robert Frost; Carlos Fuentes; Thomas Fuller; Antonio Gala; Mahatma Gandhi; Ganivet Angel; Federico Garcia Lorca; Gabriel García Márquez; Géraldy Paul; Khalil Gibran; André Gide; Goethe; Ramon Gomez de la Serna; Baltasar Gracian; Arturo Graf; Graham Greene; William Hazlitt; Friedrich Hebbel; Friedrich Hegel; Heinrich Heine; Ernest Hemingway; Heraclitus of Ephesus; George Herbert; Hesiod; Hermann Hesse; Thomas Hobbes; Oliver Wendell Holmes; Homer; Horacio; Elbert Hubbard; Victor Hugo; Aldous Huxley; Johan Henrik Ibsen; Engineers José; Eugene Ionesco; Jean Paul; Thomas Jefferson; Samuel Johnson; Joseph Joubert; John Paul II; Carl Gustav Jung; Juvenal; Franz Kafka; Immanuel Kant; Alphonse Karr; Helen Keller; Thomas De Kempis; John Fitzgerald Kennedy; Sören Kierkegaard Aabye; Martin Luther King; Rudyard Kipling; Jean de la Fontaine; François de La Rochefoucauld; Herni Dominique Lacordaire; Alphonse de Lamartine; Lao-tzu; Mariano José de Larra; Gustave Le Bon; Stanislaw Lec; John Lennon; Giacomo Leopardi; Clive Staples Lewis; Georg Christoph Lichtenberg; Abraham Lincoln; John Locke; Antonio Machado; Maurice Maeterlinck; André Malraux; Nelson Mandela; Horace Mann; Nicolas Machiavelli; Gregorio Maranon; Marquis of Vauvenargues; José Martí; Groucho Marx; Karl Marx; Ana Maria Matute; William Somerset Maugham; Francois Mauriac; Andre Maurois; Giuseppe Mazzini; Henry Louis Mencken; John Stuart Mill; Arthur Miller; Molière; Michel Montaigne; Montesquieu; Alberto Moravia; Napoleon I; Pablo Neruda; Amado Nervo; Friedrich Nietzsche; Novalis; Giovanni Papini; Blaise Pascal; Louis Pasteur; Cesare Pavese; Octavio Paz; Benito Perez Galdos; Jaume Perich; Fernando Pessoa; Francesco Petrarca; Pablo Picasso; Pythagoras of Samos; Pitigrilli; Plato; Pliny the Younger; Plutarch; Edgar Allan Poe; Enrique Poncela Jardiel; Alexander Pope; Marcel Proust; Arab proverb; Chinese proverb; Publio Siro; Francisco de Quevedo; Jean-Baptiste Racine; Santiago Ramon y Cajal; Saying; Jules Renard; Count Rivarol; Fernando de Rojas; Jean Jacques Rousseau; John Ruskin; Bertrand Russell; Ernesto Sabato; Carl Sagan; Françoise Sagan; Antoine de Saint-Exupery; José Luis Sampedro; San Agustin; George Sand; Santa Teresa de Jesus; José Saramago; Jean Paul Sartre; Fernando Savater; Friedrich Schiller; Arthur Schopenhauer; Seneca; William Shakespeare; George Bernard Shaw; Georg Simmel; Socrates; Sophocles; Germaine de Stael; Stendhal; Robert Louis Stevenson; Jonathan Swift; Tacit; Rabindranath Tagore; Mother Teresa of Calcutta; Henry David Thoreau; Enrique Tierno Galvan; Leon Tolstoy; Mark Twain; Miguel de Unamuno; Peter Alexander Ustinov; Paul Valéry; Lope de Vega; Alfred Victor de Vigny; Juan Luis Vives; Voltaire; Otto von Bismarck; Oscar Wilde; Stefan Zweig