Philosophy Books Online

Aristotle, Nichomachean Ethics: http://classics.mit.edu/Aristotle/nicomachaen.html

Marcus Aurelius, The Meditations: http://classics.mit.edu/Antoninus/meditations.html

Joseph Gerard Brennan, Introduction to Logic: https://archive.org/details/handbookoflogics029019mbp

Confucius/Kung Fu Tzu, Analects: http://classics.mit.edu/Confucius/analects.html

Rene Descartes, Discourse on the Method: http://www.gutenberg.org/files/59/59-h/59-h.htm

Epictetus, The Golden Sayings: http://classics.mit.edu/Epictetus/goldsay.html

Epicurus, Letter to Menoeceus: http://classics.mit.edu/Epicurus/menoec.html

Werner Heisenberg, Physics and Philosophy: https://archive.org/stream/PhysicsPhilosophy/Heisenberg-PhysicsPhilosophy#page/n0/mode/2up

Thomas Hobbes, Leviathan: https://www.gutenberg.org/files/3207/3207-h/3207-h.htm

David Hume, An Enquiry Concerning Human Understanding: https://archive.org/details/humeenquiry00humerich

William James, Pragmatism: https://www.gutenberg.org/files/5116/5116-h/5116-h.htm

James Jeans, Physics and Philosophy: https://archive.org/details/physicsandphilos031647mbp

John Locke, Two Treatises of Government: http://socserv2.socsci.mcmaster.ca/econ/ugcm/3ll3/locke/government.pdf

Lucretius, On the Nature of Things: http://classics.mit.edu/Carus/nature_things.html

John Stuart Mill, On Liberty: https://archive.org/details/onliberty00inmill

Thomas Nagel, What Does It All Mean?:  http://practicalphilosophy.in/wp-content/uploads/2015/10/WHAT-DOES-IT-ALL-MEAN.pdf

 

Friedrich Nietzsche, Thus Spake Zarathustra: https://www.gutenberg.org/files/1998/1998-h/1998-h.htm

Plato, Apology: http://classics.mit.edu/Plato/apology.html

Plato, The Republic: http://classics.mit.edu/Plato/republic.html

Bertrand Russell, The Problems of Philosophy: https://www.gutenberg.org/files/5827/5827-h/5827-h.htm

Bertrand Russell, Mysticism and Logic and Other Essays: https://www.gutenberg.org/files/25447/25447-h/25447-h.htm

Lao Tzu, Dao de Jing: http://classics.mit.edu/Lao/taote.1.1.html

Ludwig Wittgenstein, Tractactus Logico-Philosophicus: https://archive.org/details/in.ernet.dli.2015.218466