Its an old adage that the way to be safe is never to be secure. Each one of us requires the spur of insecurity to force us to do our best. – Harold W. Dodds

Our capacity to retaliate must be, and is, massive in order to deter all forms of aggression. – John Foster Dulles

Without a measureless and perpetual uncertainty, the drama of human life would be destroyed. – Sir Winston Churchill

There is nothing assured to mortals. – Horace