1. Pieper, J.,The Four Cardinal Virtues. University of Notre Dame Press, 1967, p.5; cf. also, Pieper,Prudence. Pantheon Books, 1959, p.14.
2. Cf. e.g., Hauerwas, S.,Character and the Christian Life. Trinity University Press, 1985, p.21.
3. Klubertanz, G.,Habits and Virtues. Appleton-Century-Crofts, 1965, p.v ff.
4. Aristotle,Nichomachian Ethics, Martin Ostwald, trans. Bobbs-Merrill Educational Publishing, 1962, p.25 ff.
5. St. Thomas Aquinas,Summa Theologica, Volume 23. New York, McGraw-Hill Book Company, 1963, Question 55 ff.