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If it had not been for the discontent of a few fellows who had not been satisfied with their conditions, you would still be living in caves. Intelligent discontent is the mainspring of civilization. Progress is born of agitation. It is agitation or stagnation.

"The Issue". Eugene V. Debs' speech in Girard, Kansas, May 23, 1908.
If it had not been for the discontent of a few fellows who had not been satisfied with their conditions, you would still be living in caves. Intelligent discontent is the mainspring of civilization. Progress is born of