Today, June 12th, is the anniversary of the "Mr. Gorbachev" wall speech.
I think I'll let President Reagan's own words speak for themselves.
I've provided the links here for you to access his words on YouTube.
There are two links, the first is a short one for the time constrained visitor. The second is the entire speech. (3:59, and 26:42 respectively).
http://www.youtube.com/watch?v=WjWDrTXMgF8&feature=youtube_gdata_player
http://www.youtube.com/watch?v=5MDFX-dNtsM&feature=youtube_gdata_player