The limits of tyrants are prescribed by the endurance of those whom they oppose.

Related:

• Power concedes nothing without a demand. It never did,
  and it never will. Find out just what people will submit...
• Power concedes nothing without a demand. It never did,
  and it never will. Find out just what people will...
• If there is no struggle, there is no progress. --
  Frederick...
• Those who profess to favor freedom, and yet depreciate agitation,
  are men who want rain without thunder and lightning...
• Those who profess to favor freedom, and yet deprecate agitation,
  are men who want rain without thunder and lightning...
• If there is no struggle, there is no progress. Those who profess to favor freedom and yet avoid confrontation,
  are people who want crops without plowing up the ground...
• All things are the same,--familiar in enterprise, momentary in endurance,
  coarse in substance. All things now are as they were...