In all matters, we can only learn by trial and error, by making mistakes and improvements; we can never rely on inspiration, although inspirations may be most valuable as long as they can be checked by experience. Accordingly, it is not reasonable to assume that a complete reconstruction of our social world would lead at once to a workable system. Rather we should expect that, owing to lack of experience, many mistakes would be made which could be eliminated only by a long and laborious process of small adjustments; in other words, by that rational method of piecemeal engineering whose
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