Inefficient nations were always conquered sooner or later, and the struggle for efficiency was inimical to illusions.
Ideas inimical to Ingsoc could only be entertained in a vague wordless form, and could only be named in very broad terms which lumped together and condemned whole groups of heresies without defining them in doing so.
It includes the power of not grasping analogies, of failing to perceive logical errors, of misunderstanding the simplest arguments if they are inimical to Ingsoc, and of being bored or repelled by any train of thought which is capable of leading in a heretical direction.
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The victim was a teacher named Kadow, head of a liberal political faction which the Nazis considered inimical to their interests.