“The price of readiness is eternal vigilance.”

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“Eternal vigilance is the price of liberty” (Deis, 2015).

Reference

Deis, R. (2015) This Day in Quotes: Eternal Vigilance is the Price of Liberty. Available from World Wide Web: http://www.thisdayinquotes.com/2011/01/eternal-vigilance-is-price-of-liberty.html. [Accessed: 09 October, 2016].