Vigilia pretium libertatis.

Related:

• As with liberty, the price of leanness is eternal vigilance.
  Gene...
• Eternal vigilance is the price of liberty--power is ever stealing from the many to the few.
  Wendell...
• Eternal Vigilance Is The Price of Liberty" used to mean we watched the government -
  not the other way around. -- Bill...
• The price of freedom is eternal vigilance. --
  Thomas...
• Eternal boredom is the price of constant vigilance.
  Marion J. Levy, Jr...
• The condition upon which God has given liberty to man is eternal vigilance.
  John Philpot Curran, in a speech July 10,...
• The price of justice is eternal
  publicity...
• Maintain eternal vigilance, small squishy thing, and kill anything that threatens.
  Viver farewell...
• The price of Justice is eternal publicity. --
  Enoch Arnold...