To celebrate the release of The Bolivian Diary by Ernesto Che Guevara, the latest addition to our new Che Guevara Library, we are proud to share an introduction written by Fidel Castro for the original publication of this book, back in 1968. The introduction is long, but it is incredibly special. Castro's interpretation of events, written so warmly and with such deference to his late friend and comrade, offers the reader an added context for the diary entries in the pages that follow, and provides a window into the impact that Che had on those he encountered. We hope you'll enjoy it.