Enchiridion. Chapter 18. The Ninth Rule
As expert captains are wont to cause, when all things are quiet, at rest and at peace, that the watch nevertheless be duly kept: likewise see thou that thou have alway thy mind watching and circumspect against the sudden assault of thine enemy (for he ever compasseth round about seeking whom he might devour) that thou mayst be the more ready as soon as he assaulteth thee to put him back manfully, to confound him and forthwith to tread underfoot the head of the pestiferous and poison serpent.
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