http://www.sunray22b.net/fabian_window.htm"Accordingly shame may be lacking in a person in two ways. First, because the things that should make him ashamed are not deemed by him to be disgraceful; and in this way those who are steeped in sin are without shame, for instead of disapproving of their sins, they boast of them." -
St Thomas; Summa Theologica - On Shamedfaceness