Two works from the father of modern philosophy. In Discourse on Method,
he formulated a scientific approach comprising four principles, including to accept only what reason recognizes as "clear and distinct." In Meditations,
he explores the mind/body distinction, the nature of truth and error, the existence of God, and the essence of material things.
Reprint of Discourse and Meditations from The Philosophical Works of Descartes, Cambridge University Press, 1911.