Abstemius's Fables (Sir Roger L'Estrange)
319. (not in Abstemius) A Boar and a Fox.
As a Boar was whetting his Teeth against a Tree, up comes a Fox to him. Pray, what do you mean by That? (says he) for I see no occasion for't. Well, says the Boar, but I do; for when I come once to be set upon, 'twill be too late for me to be Whetting when I should be Fighting.
No Man, or State can be safe in Peace, that is no always in readiness to encounter an Enemy in Case of War.
Fables of Aesop and Other Eminent Mythologists: Abstemius's Fables by Sir Roger L'Estrange. Available online at Google Books.