Courage is connected with taking risks. Jumping the Grand Canyon on a motorbike, coming over Niagara Falls in a barrel, or crossing the ocean in a rowboat are called courageous acts because people risk their lives by doing these things. But none of these daredevil acts comes from the center of our being. They all come from the desire to test our physical limits and to become famous and popular.
Spiritual courage is something completely different. It is following the deepest desires of our hearts at the risk of losing fame and popularity. It asks of us the willingness to lose our temporal lives in order to gain eternal life.