If it had not been for the discontent of a few fellows who have not been satisfied with their condition you would still be living in caves. You never would have emerged from the jungle. Intelligent discontent is the mainspring of civilization. Progress is born of agitation. It is agitation or stagnation.
¶ "The Issue," Speech, Girard, Kansas (23 May 1908)
http://www.depaul.edu/~history/webresources/usprimary/EDebs4.htm
