"A great civilization is not conquered from without until it has destroyed itself within. The essential causes of Rome’s decline lay in her people, her morals, her class struggle, her failing trade, her bureaucratic despotism, her stifling taxes, her consuming wars."*
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* Will Durant, Caesar and Christ, Epilogue, p. 665 (1944)
https://en.wikiquote.org/wiki/Civilization
William James Durant (November 5, 1885 – November 7, 1981) was an American historian and philosopher, best known for his 11-volume work, The Story of Civilization, which contains and details the history of Eastern and Western civilizations. It was written in collaboration with his wife, Ariel Durant, and published between 1935 and 1975. He was earlier noted for The Story of Philosophy (1926), described as "a groundbreaking work that helped to popularize philosophy".[1] https://en.wikipedia.org/wiki/Will_Durant