
“Blind belief in authority is the greatest enemy of truth.”
Letter to Jost Winteler (1901), quoted in The Private Lives of Albert Einstein by Roger Highfield and Paul Carter (1993), p. 79 http://books.google.com/books?id=zY7FE9ZyDO0C&lpg=PP1&pg=PA79#v=onepage&q&f=false. Einstein had been annoyed that Paul Drude, editor of Annalen der Physik, had dismissed out of hand some criticisms Einstein made of Drude's electron theory of metals.
1900s
Variant: A foolish faith in authority is the worst enemy of truth.