"Throughout the early Christian period, every great calamity - famine, earthquake, and plague - led to mass conversions, another indirect influence by which epidemic diseases contributed to the destruction of classical civilization. Christianity owes a formidable debt to bubonic plague and to smallpox, no less than to earthquake and volcanic eruptions."

Source : Hans Zinsser (2011). “Rats, Lice and History”, p.139, Transaction Publishers

Hans Zinsser

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