“Great leaps forward in history are often, in fact, giant leaps back.”

Words said when Armstrong first stepped onto the Moon (20 July 1969) One Small Step, transcript of Apollo 11 Moon landing https://www.hq.nasa.gov/alsj/a11.step.html. In the actual sound recordings he apparently fails to say "a" before "man" and says: "That's one small step for man, one giant leap for mankind." This was generally considered by many to simply be an error of omission on his part. Armstrong long insisted he did say "a man" but that it was inaudible. Prior to new evidence supporting his claim, he stated a preference for the "a" to appear in parentheses when the quote is written. The debate continues on the matter, as "Armstrong's 'poetic' slip on Moon" at BBC News (3 June 2009) http://news.bbc.co.uk/2/hi/science/nature/8081817.stm reports that more recent analysis by linguist John Olsson and author Chris Riley with higher quality recordings indicates that he did not say "a".
Variant: That's one small step for a man, one giant leap for mankind.

The Pragmatics of Patriotism (1973)
Context: Many short-sighted fools think that going to the Moon was just a stunt. But the astronauts knew the meaning of what they were doing, as is shown by Neil Armstrong's first words in stepping down onto the soil of Luna: "One small step for a man, one giant leap for mankind."

On Casino Royale. [Timothy Dalton Reflects On 007, 2007-02-19, http://www.mi6.co.uk/sections/articles/dalton_hot_fuzz.php3?t=&s=, MI6 - The Home of James Bond, 2007-02-21]
Attributed

Book Sometimes you win Sometimes you Learn

as quoted in the text of the exhibition 'Kandinsky and der Blaue Reiter', Gemeentemuseum the Hague, Netherlands; February-June, 2010
Gabriele refers to the big change she made, before the period of her first Murnau landscape paintings (c. 1904 - 1914), when she lived and worked together with Kandinsky].

Source: The Immortals Boxed Set

Counterterrorism and Cybersecurity: Total Information Awareness (2nd Edition), 2015