Edwin A. Abbott, Aristotle, Dale Carnegie, Gilbert Chesterton, René Descartes, Epictetus, Marcus Aurelius Antoninus, Sigmund Freud, Hermann Hesse, David Hume, Lao Tzu, Confucius, Swami Abhedananda, Anonimous, D. H. Lawrence, Niccolò Machiavelli, Benedictus de Spinoza, John Mill, Prentice Mulford, Thomas More, Friedrich Nietzsche, J. Allanson Picton, Plato, Sun Tzu, Vātsyāyana, Voltaire, H.G. Wells & Frances Bacon
