Mark Twain writing in Following the Equator (also known as More Tramps Abroad), published in 1897, about his tour of the British Empire two years earlier.
That men do not learn very much from the lessons of history is the most important of all the lessons that history has to teach.
Aldous Huxley, Collected Essays, “Case of Voluntary Ignorance” (1959)
Those who cannot remember the past are condemned to repeat it.
George Santayana, The Life of Reason, “Reason in Common Sense,” Volume 1 (1905).