Immanuel Kant, Søren Kierkegaard, Edmund Husserl, Ludwig Wittgenstein, Friedrich Nietzsche, Konfuzius, Plato, Xenophon, Aristotle, LaoTse, Cicero, Marcus Aurelius, Plotin, Thomas von Aquin, Niccolò Machiavelli, Thomas Morus, Giordano Bruno, Michel de Montaigne, René Descartes, Francis Bacon, Blaise Pascal, Baruch Spinoza, Gottfried Wilhelm Leibniz, David Hume, Jean-Jacques Rousseau, Friedrich Schelling, John Locke, Georg Wilhelm Friedrich Hegel, John Stuart Mill & Karl Marx