Such things will cease to be written when men perceive that truth is the only merit that gives dignity and worth to history.

John Dalberg, Lord Acton (1834-1902) British historian, politician, writer
“The Massacre of St Bartholomew,” North British Review (1869-10)

Referencing Catholic denial and revisionism over the St Bartholomew's Day Massacre. Usually elided to start with "Truth is ..."

Collected in The History of Freedom and Other Essays (1907)