A theory of necessary conditions will tend to generate a model of the open society, whereas a theory of necessary and sufficient conditions will tend… - George H. Smith

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A theory of necessary conditions will tend to generate a model of the open society, whereas a theory of necessary and sufficient conditions will tend to generate a model of the closed society. These conflicting models result from the inner logic of ideas. To offer a sketch of what is minimally necessary for a good society is to leave considerable room for diversity, variation, and change. But the available space for individuality will progressively decrease as additional details transform what had been a sketch into a veritable blueprint for the good society.