“It is in vain that we can predict and control the course of events in the future, unless we know how to live in the present. It is in vain that doctors prolong life if we spend the extra time being anxious to live still longer. It is in vain that engineers devise faster and easier means of travel if the new sights that we see are merely sorted and understood in terms of old prejudices. It is in vain that we get the power of the atom if we are just to continue in the rut of blowing people up.”