From "Paul's Letter to American Christians," as reproduced in Clayborne Carson's and Peter Holloran's A Knock at Midnight: Inspiration from the Great Sermons of Reverend Martin Luther King, Jr.
"You must come to see that is possible for a man to be self-centered in his self-denial and self-righteous in his self-sacrifice. He may be generous in order to feed his ego and pious in order to feed his pride. Man has the tragic capacity to relegate a heightening virtue to a tragic vice. Without love benevolence becomes egotism, and martyrdom becomes spiritual pride." pp. 35-6