5Thomas Aquinas, Summa Theologica, Chicago: Encyclopaedia Britannica, Inc., 1988, Part One, Question 1, Article 10.
6Dante Alighiefi, Letter to Can Grande Della Scala, in Lionel Trilling (ed.), Literary Criticism: An Introductory Reader, New York: Holt McDougal, 1970, pp. 80-81.
7赫伊津哈.《中世纪的衰落》,刘军、舒炜等译,中国美术学院出版社1997年版,第214页.
8Wladyslaw Tatarkiewicz, History of Aesthetics, trans. C. A. Kisiel and J. F. Besemeres, Bristol: Thoemmes Press, 1999, p. 98.
