“The only preventative measure one can take is to live irregularly.”

“Fear is good. In the right degree it prevents us from making fools of ourselves. But in the wrong measure it prevents us from fully living. Fear is our boon companion but never our master.”

“Any measurement must take into account the position of the observer. There is no such thing as measurement absolute, there is only measurement relative.”

“To be "in charge" is certainly not only to carry out the proper measures yourself but to see that every one else does so too; to see that no one either willfully or ignorantly thwarts or prevents such measures. It is neither to do everything yourself nor to appoint a number of people to each duty, but to ensure that each does that duty to which he is appointed.”

“A condom prevents life. A gun takes life. Would a condom over the barrel of a gun prevent one life from taking another?”

“Because civilization isn't a thing that you build and then there it is, you have it forever. It needs to be built constantly, recreated daily. It vanishes far more quickly than he ever would have thought possible. And if he wishes to live, he must do what he can to prevent the world he wants to live in from fading away. As long as there's war, life is a preventative measure.”