History has often showed us the strength of the forces that are unleashed by the yearning for freedom. It moved people to overcome their fears and openly confront dictators such as in East Germany and Eastern Europe about 22 years ago. […] The yearning for freedom cannot be contained by walls for long. It was this yearning that brought down the Iron Curtain that divided Germany and Europe, and indeed the world, into two blocs.

Remarks by President Obama and Chancellor Merkel in an Exchange of Toasts on June 07, 2011.