“Do not trust the horse, Trojans.
Whatever it is, I fear the Greeks even when they bring gifts.”

Book II, lines 66–68
The Æneis (1817)

P 260
The Piano Teacher (1988)

Unkempt Thoughts (1957)

Source: The Memoirs of Herbert Hoover: The Great Depression, 1929-1941 (1952), p. 357

It was the tactic of Lenin, Hitler, and Mussolini. In the collectivist sweep over a dozen minor countries of Europe, it was the cry of men striving to get on horseback. And 'emergency' became the justification of the subsequent steps. This technique of creating emergency is the greatest achievement that demagoguery attains... The invasion of New Deal Collectivism was introduced by this same Trojan horse.

p. 357
The Memoirs of Herbert Hoover: The Great Depression, 1929-1941 (1952)

2000s
Context: Islam is the Trojan Horse in Europe. If we do not stop Islamification now, Eurabia and Netherabia will just be a matter of time. One century ago, there were approximately 50 Muslims in the Netherlands. Today, there are about 1 million Muslims in this country. Where will it end? We are heading for the end of European and Dutch civilisation as we know it.

On the benefits of emigration of intelligent and skilled workers from India to other nations, as quoted in "Return Passage to India: Emigres Pay Back" by Celia W. Dugger, in The New York Times (29 February 2000) http://www.nytimes.com/2000/02/29/world/return-passage-to-india-emigres-pay-back.html?pagewanted=all; also cited in: Kishore Mahbubani, The New Asian Hemisphere: The Irresistible Shift of Global Power to the East https://books.google.nl/books?id=3bNEcyRxk3oC&pg=PA69&lpg=PA69&dq=charles+leadbeater++%22from+west+to+east%22&source=bl&ots=5P_cDPHVZF&sig=GfkXHeh-xNDhko5-h2NqD67zP5E&hl=nl&sa=X&ved=0ahUKEwjF_afS-qzLAhXHzxQKHUcKBEoQ6AEIKDAB#v=onepage&q=Bhagwati&f=false (2010), p. 71
Context: The emigres often work as a Trojan horse, lobbying on your behalf. They use external opportunities to succeed prodigiously in different occupations. And they can bring their skills and funds home to assist the country in its economic takeoff.

Letter (20 August 1959), as quoted in Victoria Glendinning, Rebecca West: A Life (1987), Part 5, Chapter 8, p. 206

Source: Big Magic: Creative Living Beyond Fear