The Nazis entered this war under the rather childish delusion that they were going to bomb everyone else, and nobody was going to bomb them. At Rotterdam, London, Warsaw, and half a hundred other places, they put their rather naive theory into operation. They sowed the wind, and now they are going to reap the whirlwind.
While day by day the overzealous student stores up facts for future use, he who has learned to trust nature finds need for ever fewer external directions. He will discard formula after formula, until he reaches the conclusion: Let nature take its course.