Because if you lived as I did several years under Nazi totalitarianism and then 20 years in communist totalitarianism you would certainly realize how precious freedom is and how easy it is to lose your freedom.
We must plan for freedom and not only for security if for no other reason than that only freedom can make security secure.
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If this liberal potential is properly channeled we may expect the area of freedom of the United States to increase. The problem is to spend up our rate of social invention in the service of the welfare of all the people.