"I think we could solve our problems more easily through strength of character; but that's always been a commodity in extremely short supply."
Interesting early use of the "force field" idea; note that the authors felt that the barrier needed wires to carry energy.
Compare with the force-field from John Campbell's 1931 story Islands of Space, the barrier from Robert Heinlein's 1940 novella Coventry and the Langston field from Niven and Pournelle's 1974 classic The Mote in God's Eye.
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