diff -r 780100cd4060 -r 1343540ed715 ProgTutorial/First_Steps.thy
--- a/ProgTutorial/First_Steps.thy	Mon Nov 07 13:36:07 2011 +0000
+++ b/ProgTutorial/First_Steps.thy	Mon Nov 07 16:13:26 2011 +0000
@@ -13,15 +13,10 @@
 chapter {* First Steps\label{chp:firststeps} *}
 
 text {*
-   \begin{flushright}
-  {\em
-  ``We will most likely never realize the full importance of painting the Tower,\\ 
-  that it is the essential element in the conservation of metal works and the\\ 
-  more meticulous the paint job, the longer the tower shall endure.''} \\[1ex]
-  Gustave Eiffel, in his book {\em The 300-Meter Tower}.\footnote{The Eiffel Tower has been 
-  re-painted 18 times since its initial construction, an average of once every 
-  seven years. It takes more than one year for a team of 25 painters to paint the tower 
-  from top to bottom.}
+  \begin{flushright}
+  {\em ``The most effective debugging tool is still careful thought,\\ 
+  coupled with judiciously placed print statements.''} \\[1ex]
+  Brian Kernighan, in {\em Unix for Beginners}, 1979
   \end{flushright}
 
   \medskip