Authors:

Card players have a saying: "It's all right to play if you keep your eyes on the deck" - which is another way of saving, "Eternal vigilance is the price of liberty."

Interview with Joe Hyams, reprints.longform.org. February 1963.
Card players have a saying: It's all right to play if you keep your eyes on the deck - which is another way of saving, Eternal vigilance is the price of liberty.