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“In science,” said the late Sir Arthur Eddington, “we sometimes have convictions which we cherish but cannot justify; we are influenced by some innate sense of the fitness of things.” This may sound a perilously subjective and aesthetic criterion; but can one doubt that it is a principal source of our belief in Uniformity? A universe in which unprecedented and unpredictable events were at every moment flung into Nature would not merely be inconvenient to us: it would be profoundly repugnant. We will not accept such a universe on any terms whatever. It is utterly detestable to us. It shocks our “sense of the fitness of things.” In advance of experience, in the teeth of many experiences, we are already enlisted on the side of uniformity. For of course science actually proceeds by concentrating not on the regularities of Nature but on her apparent irregularities. It is the apparent irregularity that prompts each new hypothesis. It does so because we refuse to acquiesce in irregularities: we never rest till we have formed and verified a hypothesis which enables us to say that they were not really irregularities at all. Nature as it comes to us looks at first like a mass of irregularities. The stove which lit all right yesterday won’t light today; the water which was wholesome last year is poisonous this year. The whole mass of seemingly irregular experience could never have been turned into scientific knowledge at all unless from the very start we had brought to it a faith in uniformity which almost no number of disappointments can shake.

C. S. Lewis (from Miracles, 1947)

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