What does this quote mean Courage is resistance to fear mastery of fear-not absence of fear?

First, I think that we should rewrite this quote with better punctuations to make it easier to understand:

"Courage is resistance to fear, mastery of fear - not absence of fear." (Mark Twain)

I think that "Courage is resistance to fear" means that it is sort of an antagonist to fear. That's pretty straight forward...

Then, "mastery of fear - not absence of fear" probably means that someone with courage will still have fear; it doesn't mean that he won't have or feel any fear, however he will use his courage to "master", control, and/or manage the fear and get passed it.