Authors
- Adam Smith
- Adi Granth
- Adi Shankara
- Al-Farabi
- Al-Ghazali
- Alexander Berkman
- Alexis de Tocqueville
- Alfred Adler
- Alfred Binet
- Allan Kardec
- Anaxagoras
- Angel Ganivet
- Anselm of Canterbury
- Anselm Turmeda
- Aristotle
- Arthur Schopenhauer
- Athanasius
- Auguste Comte
- Augustine
- Ausias March
- Averroes
- Avesta
- Avicenna
- Baltasar Gracian
- Bardo Thodol
- Bartolome de las Casas
- Baruch Spinoza
- Basil of Caesarea
- Benito Feijoo
- Bernat Metge
- Bhagavad Gita
- Bible
- Boethius
- Bonaventure
- Book of the Dead
- Charles Darwin
- Charles Peirce
- Christine de Pizan
- Cicero
- Clement I
- Confucius
- David Hume
- David Ricardo
- Democritus
- Denis Diderot
- Descartes
- Dhammapada
- Diamond Sutra
- Diogenes Laertius
- Duns Scotus
- Edmund Burke
- Edmund Husserl
- Eduard Bernstein
- Edward B. Titchener
- Émile Durkheim
- Emma Goldman
- Empedocles
- Epictetus
- Epicurus
- Erasmus
- F. H. Bradley
- Flora Tristan
- Francesc Eiximenis
- Francis Bacon
- Francisco de Vitoria
- Franz Brentano
- Friedrich Engels
- G. Stanley Hall
- Georg Simmel
- George Berkeley
- Georges Sorel
- Giambattista Vico
- Gilgamesh
- Giordano Bruno
- Giovanni Gentile
- Gottfried Wilhelm Leibniz
- Gotthold Ephraim Lessing
- Gottlob Frege
- Gregory I
- Gregory of Nyssa
- Gustav Theodor Fechner
- Hadith
- Han Fei
- Harriet Martineau
- Harriet Taylor
- Havelock Ellis
- Hegel
- Henri Bergson
- Henry David Thoreau
- Heraclitus
- Herbert Spencer
- Hesiod
- Hugo Grotius
- Huineng
- I Ching
- Iamblichus
- Ibn Khaldun
- Ibn Tufayl
- Ignatius of Antioch
- Immanuel Kant
- Innocent III
- Irenaeus
- Ivan Pavlov
- Jacob Boehme
- Jaime Balmes
- Jaina Sutras
- James Mark Baldwin
- Jean-Jacques Rousseau
- Jean-Martin Charcot
- Jeremy Bentham
- Johann Fichte
- Johann Gottfried Herder
- John B. Watson
- John Calvin
- John Chrysostom
- John Dewey
- John Locke
- John of the Cross
- John Stuart Mill
- Joseph de Maistre
- Josiah Royce
- Juan Donoso Cortés
- Juan Luis Vives
- Judith Drake
- Justin Martyr
- Karl Marx
- Kautilya
- Kojiki
- Kurt Koffka
- Laozi
- Laws of Manu
- Leo I
- Leo Tolstoy
- Leo XIII
- Leon Trotsky
- Lev Vygotsky
- Liezi
- Lotus Sutra
- Lucius Annaeus Seneca
- Lucretius
- Ludwig Feuerbach
- Mabinogion
- Machiavelli
- Mahabharata
- Mahatma Gandhi
- Maimonides
- Marcus Aurelius
- Marquis de Condorcet
- Martin Luther
- Mary Astell
- Mary Wollstonecraft
- Max Stirner
- Max Weber
- Max Wertheimer
- Meister Eckhart
- Mencius
- Michel de Montaigne
- Miguel de Unamuno
- Mikhail Bakunin
- Montesquieu
- Moses Mendelssohn
- Nicholas of Cusa
- Nicolas Malebranche
- Nietzsche
- Nihongi
- Olympe de Gouges
- Omar Khayyam
- Origen of Alexandria
- Otto Rank
- Parmenides
- Pascal
- Patanjali
- Peter Abelard
- Peter Kropotkin
- Philip Melanchthon
- Philo of Alexandria
- Pi i Margall
- Pierre Bayle
- Pistis Sophia
- Pius V
- Plato
- Plotinus
- Plutarch
- Poetic Edda
- Polycarp
- Popol Vuh
- Porphyry
- Proclus
- Proudhon
- Quran
- Rabindranath Tagore
- Ralph Waldo Emerson
- Ramayana
- Ramon Llull
- Rig Veda
- Rosa Luxemburg
- Rumi
- Sándor Ferenczi
- Sextus Empiricus
- Shaftesbury
- Shijing
- Sigmund Freud
- Simon Bolivar
- Snorri Sturluson
- Sophocles
- Sor Juana Inés de la Cruz
- Søren Kierkegaard
- Sun Tzu
- Swami Vivekananda
- Tanakh
- Teresa of Ávila
- Tertullian
- Théodule-Armand Ribot
- Thomas a Kempis
- Thomas Aquinas
- Thomas Hobbes
- Thomas Malthus
- Thomas More
- Thomas Paine
- Thomas Reid
- Ulrich Zwingli
- Upanishads
- Vladimir Lenin
- Voltaire
- Voltairine de Cleyre
- Wilhelm Dilthey
- Wilhelm Wundt
- William Godwin
- William James
- William of Ockham
- Xenophon
- Zhuang Zhou