Note: Paul Deussen, The Elements of Metaphysics: Being a Guide for Lectures and Private Use, trans. by C. Mabel Duff (London: Macmillan Publishers Ltd., 1894), p. 337.
Bibliography: Deussen, Paul. The Elements of Metaphysics: Being a Guide for Lectures and Private Use. Translated by Duff, C. Mabel. London: Macmillan Publishers Ltd., 1894.