1. 1. For the most famous challenge to this conception of knowledge, see Ernest L. Gettier, “Is Justified True Belief Knowledge?” in Knowledge and Belief, ed. Allen Phillips-Griffiths (Oxford: Oxford University Press, 1967).
2. 2. Plato, Theaetetus, in Plato: The Collected Dialogues, ed. Edith Hamilton and Huntington Cairns (Princeton, NJ: Princeton University Press, 1961), 845-919.
3. 3. Plato, Theaetetus, 152a, 856.
4. 4. Thomas Nagel, The View from Nowhere (Oxford: Oxford University Press 1989).
5. 5. For example, Alasdair C. MacIntyre, After Virtue: A Study in Moral Theory (South Bend, IN: Notre Dame Press, 1981); Charles Taylor, Sources of the Self: The Making of Modern Identity (Cambridge, MA: Harvard University Press, 1989); Charles Taylor, A Secular Age (Cambridge, MA: Harvard University Press, 2007).