Rules for the direction of the mind. Discourse on the method. Meditations on first philosophy. Objections against the meditations and replies. The geometry, by René Descartes. Ethics, by Benedict de Spinoza.
Descartes works translated by Elizabeth S. Haldane and G. R. T. Ross; The geometry, translated by David Eugene Smith and Marcia L. Latham; Ethics, translated by W. H. White, revised by A. H. Stirling.