Edward Gibbon Quote

Yet the experience of four thousand years should enlarge our hopes, and diminish our apprehensions: we cannot determine to what height the human species may aspire in their advances towards perfection; but it may safely be presumed, that no people, unless the face of nature is changed, will relapse into their original barbarism.

The History Of The Decline And Fall Of The Roman Empire... The Second Edition (ed. 1781)