Quote

Intelligence reports say he Castro is very worried about me. I'm very worried that we can't come up with something to justify his worrying.

  —from Ronald Reagan's presidential diaries, Wed. Feb. 11 (but I don't know what year)

You can find more in snippets being published by Vanity Fair (and no, I don't normally look there!):

http://www.vanityfair.com/politics/features/2007/06/reagan200706