Twenty errors in practice are as nothing compared with one error in principle. Twenty errors in practice may be corrected, and the twenty-first may n… - Henry Edward Manning

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Twenty errors in practice are as nothing compared with one error in principle. Twenty errors in practice may be corrected, and the twenty-first may never be committed; but one erroneous principle is like a damaged wheel in a machine. It can never work correctly afterwards. One speculative error will produce an infinite series of practical errors. The series is inexhaustible, until the machine itself is either amended or destroyed.