1. E. Troeltsch , Religion in History (Minneapolis, MN: Fortress Press, 1991), pp. 33–45
2. A. Schopenhauer , The World as Will and Representation (New York: Dover, 1958), vol. 1, p. 323
3. F. Schleiermacher , On Religion (Cambridge: Cambridge University Press, 1988), pp. 31–2
4. D. Robinson , ed., The Spiritual Emerson (Boston, MA: Beacon Press, 2003), pp. 67–70
5. J. Locke , The Reasonableness of Christianity, with A Discourse of Miracles and Part of a Third Letter Concerning Toleration, ed. I. T. Ramsey (Palo Alto, CA: Stanford University Press, 1958), pp. 10–11, 55–63