1. Galileo Galilei
"Eppur si muove!" ("And yet it moves.")
Galileo Galilei, Abjuration, 22 Jun 1633
2. Karl Marx and Friedrich Engels
"The proletarians have nothing to lose but their chains. They have a world to win. Working men of all countries, unite!"
3. Nelson Mandela
"I have cherished the ideal of a democratic and free society in which all persons live together in harmony and with equal opportunities. It is an ideal, which I hope to live for and to achieve. But if needs be, it is an ideal for which I am prepared to die."
4. Ronald Reagan
"Mr. Gorbachev, tear down this wall."