Intelligent discontent is the mainspring of civilization. Progress is born of agitation. It is agitation or stagnation.

Intelligent discontent is the mainspring of civilization. Progress is born of agitation. It is agitation or stagnation.

明智的不满是文明的主要源泉。进步源于激荡。它是躁动或停滞。

-- Eugene V. Debs 尤金·V·德布斯