Courage is making the effort to do the right thing, even in the face of uncertainty regarding the outcome. There are times we can be certain of a positive outcome, if we make the effort, and these times require no courage at all. Then, there are other times where we are fairly certain of a negative outcome and these are the times that require great courage.
The most significant act of courage is when you confront evil even when it does not affect you and you stand to lose from this behavior.
"Courage is going from failure to failure without losing enthusiasm." -Winston Churchill