If civilisation has got the better of barbarism when barbarism had the world to itself, it is too much to profess to be afraid lest barbarism, after having been fairly got under, should revive and conquer civilisation. A civilisation that can thus succumb to its vanquished enemy, must first have become so degenerate, that neither its appointed priests and teachers, nor anybody else, has the capacity, or will take the trouble, to stand up for it. If this be so, the sooner such a civilisation receives notice to quit the better. It can only go on from bad to worse, until destroyed and regenerated (like the Western Empire) by energetic barbarians. (p. 114)

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