The quip I found was from One of his papers (EWD 287) which can be found [link|http://www.cs.utexas.edu/users/EWD/indexBibTeX.html|through the BibTeX index of his papers at UT-Austin] (Note: These papers are generally in PDF format, but don't try to use them; they are basically digital images of photocopies of his original papers, which were generally typed on a manual typewriter -- some with words overstruck with X's to "eease" them...how quaint!)

The quote, from [link|http://www.cs.utexas.edu/users/EWD/ewd02xx/EWD287.PDF|this paper] is:

"If FORTRAN has been called an infantile disorder, PL/I must be classified as a fatal disease."


(Also not that he numbers his pages starting from 0...a true visionary in his field...)