Even when laws have been written down, they ought not always to remain unaltered.
Geologists have discovered many unaltered Precambrian sediments, and they contain no fossils of complex organisms.
Brisk and prompt to war, soft and not in the least able to resist calamity, fickle in catching at schemes, and always striving after novelties – French characteristics remained unaltered twenty centuries after Julius Caesar made a note of them for all time.
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