vigilance, n.All

Vigilance is impossible to keep up ceaselessly — Not even Apollo keeps his bow always at full stretch.

Vigilance is not to be overdone — when eternal, it leads to permanent insomnia.

Vigilance is not to be relaxed when the enemy is defeated — remove the claws of even a boiled crab.

Vigilance is less effective with time -- a bow long bent grows weak.

Vigilance is not to be overdone — a bow long bent at last waxeth weak.

Vigilance is not only the price of liberty, but of success of any sort.

Vigilance is not to be overdone — when eternal, comes at the price of liberty.

Vigilance is most needed after a near-miss — one is most in danger of being run over when one has just avoided a carriage.