Twenty-five years ago Tuesday, President Ronald Reagan made his famous speech at the Berlin Wall in which he declaimed:

General Secretary Gorbachev, if you seek peace, if you seek prosperity for the Soviet Union and Eastern Europe, if you seek liberalization: Come here to this gate! Mr. Gorbachev, open this gate! Mr. Gorbachev, tear down this wall!

On a trip to East Germany in 2006 I talked to a politician who had been involved in the 1989 Leipzig protests that led to the opening of the Berlin Wall. I asked him, “When Reagan said ‘Mr. Gorbachev, tear down this wall!’ in 1987, did you know that?” He said, yes, not from East German TV but from West German TV, which they could watch. And what did you think, I asked. “We thought it was good, but we thought it was impossible.” And yet just two years later, “peace prayers” in Leipzig’s Nikolaikirche turned into protests for liberalization and open borders. The Leipzig politician told me, “As it says in the Bible, we walked seven times around the inner city, and the wall came down.”

Then I went to a museum exhibit in Leipzig on the history of the German Democratic Republic. It was very impressive, with a large collection of posters, letters, newspapers, video, and more. Alas, it was all in German, so I had only a dim understanding of what it all said. I did get the impression that it wasn’t a balanced presentation of communism such as might be found in a Western museum; these curators knew that communism had been a nightmare, and they were glad to be out of it. As it happened, the only English words in the entire exhibit came in the collection of audio excerpts that greeted visitors in the entry foyer. And they were a familiar voice proclaiming: “Mr. Gorbachev, open this gate!”