"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."

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Such is the constitution of man that labour may be styled its own reward; nor will any external incitements be requisite, if it be considered how much happiness is gained, and how much misery escaped, by frequent and violent agitation of the body.

— Samuel Johnson